Updating Terms of Service: Arbitration Notice & Lessons from Amazon

The Facts

Amazon Flex drivers formed private Facebook groups to discuss working conditions, pay, and logistics issues. Amazon allegedly monitored these off-platform conversations without drivers' knowledge or consent.

Drivers filed a class action alleging violations of:

• Federal Wiretap Act (18 U.S.C. § 2511)
• California Invasion of Privacy Act (CIPA, Penal Code § 632)
• Stored Communications Act
• Common law invasion of privacy

Amazon's Defense: Arbitration

Amazon moved to compel arbitration, citing its 2019 Terms of Service. The 2019 TOS contained a broader arbitration clause that arguably covered off-platform privacy claims.

The lead plaintiff argued the 2016 TOS applied because he never received notice of the 2019 update. The parties agreed that if the 2016 TOS governed, the court—not an arbitrator—would decide arbitrability.

The Ninth Circuit's Holding

The court held Amazon failed to establish mutual assent to the 2019 TOS because it couldn't prove:

1. What notice it sent (no copy of the email or in-app notification)
2. When notice was sent
3. That the driver received it
4. That the driver accessed the app after receiving notice

Because Amazon bore the burden of proving mutual assent and failed, the 2016 TOS applied. And because the drivers' privacy claims didn't "arise out of or relate to" the service agreement (non-drivers could have asserted the same claims), the 2016 arbitration clause didn't cover the dispute.

Based on the Amazon Flex case and subsequent Ninth Circuit precedent, here's what enforceable arbitration clauses must include:

Element 1: Maximum Scope Language

Include this language (or similar):

"You and [Company] agree that any dispute, claim, or controversy arising out of or relating to (a) these Terms, (b) your access to or use of the Service, (c) any communications or interactions with [Company], whether written, verbal, electronic, or otherwise, (d) your relationship with [Company], whether as a user, customer, contractor, or otherwise, or (e) any alleged violation of law by [Company], its employees, agents, or contractors, shall be resolved exclusively by binding arbitration, rather than in court."

This language covers off-platform conduct, pre-contractual communications, and claims by non-users who interacted with your company.

Element 2: Delegation Clause

Add this paragraph immediately after the arbitration scope clause:

"The arbitrator, not any court or agency, shall have exclusive authority to resolve any dispute relating to the interpretation, applicability, enforceability, or formation of this arbitration agreement, including any claim that all or part of it is void or voidable, or that a particular claim is subject to arbitration."

This removes courts from the arbitrability question and assigns it to the arbitrator, who is statistically more likely to compel arbitration.

Element 3: Named Arbitration Provider

Specify AAA (American Arbitration Association) or JAMS. Include fallback language:

"Arbitration shall be administered by the American Arbitration Association (AAA) under its Consumer Arbitration Rules. If AAA is unavailable, the parties shall select a mutually agreeable arbitration provider. If no agreement can be reached, a court shall appoint an arbitration provider."

Element 4: Location and Venue

Specify arbitration location. For consumer contracts, offer flexibility:

"Arbitration shall take place in [County, State], or at a location mutually agreed upon by the parties. At your option, arbitration may be conducted via telephone, video conference, or written submissions."

Element 5: Cost Allocation

For consumer contracts, courts require companies to pay arbitration filing fees:

"[Company] will pay all AAA filing, administration, and arbitrator fees for claims under $10,000, unless the arbitrator finds your claim frivolous under AAA rules. You are responsible for your own attorneys' fees unless applicable law or the arbitrator's award provides otherwise."

Element 6: Class Action Waiver

"You and [Company] agree that each party may bring claims against the other only in an individual capacity, and not as a plaintiff or class member in any purported class, consolidated, or representative proceeding."

Warning: Class action waivers are unenforceable in California employment contracts and certain consumer contexts. Consult counsel.

Element 7: Opt-Out Mechanism

To strengthen enforceability, offer users an opt-out window:

"You may opt out of this arbitration agreement by sending written notice to [email/address] within 30 days of first accepting these Terms. Your opt-out notice must include your name, email address, and a clear statement that you wish to opt out of arbitration."

Here's a step-by-step protocol to ensure your TOS updates are enforceable:

• Draft the updated TOS. Highlight material changes (arbitration, liability caps, data usage, termination rights).
• Prepare multi-channel notice. Email + in-app banner + login interstitial (where feasible).
• Set an effective date 30+ days out. Give users time to review before the new terms take effect.
• Draft the notice email. Use subject line: "Important: Updated Terms of Service Effective [Date]." Include summary of key changes, link to full terms with changes highlighted, and explanation of continued use = acceptance.
• Send email to all active users. Use a transactional email service (SendGrid, Postmark) that provides delivery logs and open/click tracking.
• Display in-app banner. "Our Terms of Service have been updated. [Review Changes] [Effective May 1, 2026]." Log banner impressions per user.
• Consider login interstitial. For high-stakes changes (new arbitration clause), require click-wrap acceptance: "I have read and agree to the updated Terms of Service [checkbox]." Log acceptance timestamp.
• Archive everything. Save email template, send list, delivery logs, banner screenshots, in-app notification logs, and acceptance timestamps. Store for 7+ years.
• Monitor for failures. Track email bounces, unsubscribes, and users who contact support claiming they didn't receive notice.
• Follow up. For users with bounced emails or no activity post-notice, consider follow-up email or account suspension with notice requirement before reactivation.

Browse-Wrap vs. Click-Wrap: When Is Each Appropriate?

Browse-wrap (continued use = acceptance) is acceptable for minor, non-material updates (privacy policy URL change, new contact email). It's risky for material changes like new arbitration clauses or liability caps.

Click-wrap (affirmative consent required) is the gold standard for material changes. Courts heavily favor click-wrap because it demonstrates unambiguous assent.

When to use click-wrap for TOS updates:

• Adding or broadening an arbitration clause
• Adding a class action waiver
• Changing liability caps or disclaimers
• Modifying data usage or privacy practices (especially for EU users under GDPR)
• Expanding permitted company conduct (e.g., monitoring off-platform activity)

Answer 7 questions about your current TOS update process to receive a compliance risk assessment and specific action items.

What Is a Delegation Clause?

A delegation clause is a provision within an arbitration agreement that assigns the arbitrator—rather than a court—the authority to decide threshold questions of arbitrability, including:

• Whether a particular claim falls within the scope of the arbitration clause
• Whether the arbitration agreement is valid and enforceable
• Whether a party waived arbitration
• Whether the arbitration clause is unconscionable

Why Delegation Clauses Matter

Without a delegation clause, courts decide arbitrability. Courts are institutionally more skeptical of arbitration than arbitrators are. Arbitrators, selected by parties and compensated for their services, have a pro-arbitration bias.

The Supreme Court has upheld delegation clauses as enforceable contracts-within-contracts. See Rent-A-Center, West, Inc. v. Jackson, 561 U.S. 63 (2010). The Court held that challenges to the arbitration agreement as a whole must go to the arbitrator if a delegation clause exists, unless the challenge specifically attacks the delegation clause itself.

Model Delegation Clause Language

"The arbitrator shall have exclusive authority to resolve any dispute relating to the interpretation, applicability, enforceability, or formation of this arbitration agreement, including but not limited to any claim that all or part of this arbitration agreement is void or voidable, any claim that a particular dispute is subject to arbitration, and any claim that a party has waived its right to arbitrate. This delegation of authority to the arbitrator includes disputes about the validity of this delegation clause itself. The arbitrator's authority under this clause is independent of the validity of the remainder of the arbitration agreement."

When Courts Still Decide Arbitrability

Even with a delegation clause, courts will decide arbitrability if:

• The party opposing arbitration specifically challenges the delegation clause itself (not the broader arbitration agreement)
• The delegation clause is unconscionable (one-sided, hidden, or imposed without meaningful choice)
• The arbitration agreement as a whole was never formed (no mutual assent)

Browse-Wrap Agreements

Definition: Terms that bind users based on continued use of a website or app, typically with a link to terms buried in a footer or settings menu.

Enforceability: Low. Courts frequently reject browse-wrap agreements, especially when:

• The link to terms is not conspicuous (small font, blends into background, no visual prominence)
• No notice is provided that continued use = acceptance
• The user has no opportunity to review terms before use

Leading case: Nguyen v. Barnes & Noble, Inc., 763 F.3d 1171 (9th Cir. 2014). The court held that a TOS link at the bottom of every page, in small gray font, did not provide sufficient notice to bind users.

Click-Wrap Agreements

Definition: Terms that require affirmative consent before access (checking a box, clicking "I agree," typing "I accept").

Enforceability: High. Courts consistently uphold click-wrap agreements where:

• The user must take an affirmative action to indicate assent
• The terms are provided or linked before the action
• The user cannot proceed without assenting

Leading case: Fteja v. Facebook, Inc., 841 F. Supp. 2d 829 (S.D.N.Y. 2012). Court upheld Facebook's TOS where users had to click "Sign Up" after being presented with terms, even though terms required scrolling.

Hybrid: Modified Browse-Wrap

Some platforms use a middle approach: conspicuous notice + scroll-wrap. Example: "By clicking 'Continue,' you agree to our [Terms of Service] and [Privacy Policy]."

This is more enforceable than pure browse-wrap but weaker than click-wrap with a checkbox.

Best Practices for TOS Acceptance

Scenario	Recommended Method
New user signup	Click-wrap with checkbox
Material TOS update (arbitration, liability)	Login interstitial with click-wrap
Minor TOS update (contact email, non-material)	Email notice + in-app banner (browse-wrap acceptable)
Privacy policy update under GDPR/CCPA	Click-wrap consent for material changes
API or developer terms	Click-wrap before API key issuance

Q1: What is the significance of the Amazon Flex case for terms of service arbitration clauses?

The Ninth Circuit Amazon Flex case established that companies bear the burden of proving adequate notice when updating terms of service. Amazon failed to show it provided notice of its 2019 TOS update, rendering the broader arbitration clause unenforceable. The court found drivers' privacy claims fell outside the scope of the 2016 TOS arbitration clause because the claims didn't depend on contract terms—non-drivers could have asserted the same claims.

Q2: How do I prove I notified users of TOS updates?

Maintain email delivery logs with timestamps, server logs showing app access post-notification, in-app notification display records, and screenshots of the notification mechanism. Amazon's failure in the Flex case was not lack of notice, but lack of proof—they couldn't provide the court with evidence of what notice was sent or that the driver received it.

Q3: What is a delegation clause and why does it matter?

A delegation clause assigns the arbitrator—not the court—the authority to decide threshold questions of arbitrability (whether a claim must be arbitrated). Without a delegation clause, courts will decide whether your arbitration clause covers a particular dispute. Model language: "The arbitrator shall have exclusive authority to resolve any dispute relating to the interpretation, applicability, enforceability, or formation of this arbitration agreement, including any claim that all or part of it is void or voidable."

Q4: What's the difference between browse-wrap and click-wrap for TOS acceptance?

Click-wrap requires affirmative consent (checking a box, clicking "I agree") and is strongly enforceable. Browse-wrap relies on continued use after notice and is frequently rejected by courts, especially if the TOS link isn't conspicuous. Amazon's 2019 TOS update attempted browse-wrap notice ("continued use constitutes acceptance"), which the Ninth Circuit rejected due to inadequate proof of notice.

Q5: How broad should my arbitration clause be?

Draft arbitration clauses to cover "any dispute or claim arising out of or relating to your access to or use of the service, this agreement, or your relationship with the company, whether based in contract, tort, statute, fraud, misrepresentation, or any other legal theory." Amazon's 2016 clause was limited to disputes "arising out of or relating to this Agreement," which the court found too narrow to cover off-platform privacy claims.

Q6: Can I enforce arbitration for off-platform user conduct?

Not unless your TOS explicitly address off-platform conduct and your arbitration clause is correspondingly broad. The Amazon Flex drivers' Facebook conversations occurred off-platform. The court held that because non-drivers could assert the same privacy claims, the claims didn't "arise out of" the contract, defeating arbitration. If your business monitors users off-platform, your TOS must state this and your arbitration clause must cover "your relationship with the company" beyond just "this agreement."

Q7: Do I need affirmative consent to TOS updates?

While not strictly required in all jurisdictions, affirmative consent (click-wrap) is the gold standard for enforceability. Browse-wrap ("continued use constitutes acceptance") is risky. If you must use browse-wrap, provide multiple forms of notice (email + in-app banner), require login after notice, and maintain detailed logs of when users accessed the service post-notification.

Q8: How often should I review my TOS with counsel?

Annually at minimum, and immediately after any significant business model change, new product launch, regulatory change, or adverse legal precedent in your industry. The Amazon Flex case demonstrates that a 3-year gap between TOS versions can create enforcement problems, especially if arbitration clause scope evolves.

Q9: What constitutes "adequate notice" of TOS changes under California law?

Adequate notice requires: (1) actual delivery of notice to the user via a reliable channel (email to address on file, in-app notification), (2) conspicuous identification that terms have changed, (3) reasonable opportunity to review changes before continued use, and (4) documentary proof of all three. The Ninth Circuit held Amazon failed because it couldn't prove what notice it sent or that the driver received it.

Q10: Can arbitration clauses cover claims by non-users?

Generally no. Arbitration is contractual, requiring mutual assent. The Amazon Flex court noted that driver spouses or union organizers in the same Facebook groups could assert identical privacy claims without being bound by Amazon's TOS. If a claim can be asserted by someone who never agreed to your terms, your arbitration clause won't compel arbitration even for users who did agree.

Q11: What should my TOS update email include?

Include: (1) clear subject line ("Important: Updated Terms of Service"), (2) effective date of changes, (3) summary of material changes (especially arbitration, liability, privacy), (4) link to full terms with changes highlighted, (5) explanation of what action is required (e.g., "Continued use after [date] constitutes acceptance"), and (6) contact for questions. Retain the email template, send logs, and delivery receipts.

Q12: Are email-only TOS update notices sufficient?

Risky as sole method. Best practice: multi-channel notice (email + in-app banner + login interstitial). Email has deliverability issues (spam filters, outdated addresses, user never checks). If relying on email, use a transactional email service that provides delivery confirmation, track opens/clicks, and follow up with in-app notice.

Q13: What is "mutual assent" and why did Amazon fail this test?

Mutual assent means both parties knowingly agreed to the contract terms. The Ninth Circuit held Amazon failed to establish mutual assent to the 2019 TOS because it provided no evidence that the driver received notice of the update or had an opportunity to review it before continuing to use the app. Mere assertion of notice is insufficient; the party seeking to enforce updated terms bears the burden of proof.

Q14: Should I include a class action waiver in my arbitration clause?

Yes, if you want to avoid class arbitration. Include explicit language: "You and the Company agree that each may bring claims against the other only in an individual capacity and not as a plaintiff or class member in any purported class or representative proceeding." However, be aware that class action waivers in arbitration agreements are unenforceable in some contexts (e.g., California employment, certain consumer claims).

Q15: How do I draft enforceable arbitration clauses in 2026?

Seven elements: (1) broad scope covering "any dispute relating to your relationship with the company," not just "this agreement"; (2) delegation clause assigning arbitrability questions to the arbitrator; (3) named arbitration provider (AAA, JAMS); (4) location/venue specification; (5) cost allocation (company pays filing fees for consumer claims); (6) opt-out mechanism (30-60 days from acceptance); (7) severability clause preserving the rest of the TOS if arbitration is struck down. Review annually.