Phia Faces Scrutiny Over Cookie Stuffing

Phia, the AI shopping assistant co-founded by Phoebe Gates and Sophia Kianni, is facing serious allegations of affiliate commission manipulation. Launched in January 2023, the startup quickly garnered attention and significant funding, positioning itself as an innovative tool for smarter, more sustainable shopping.

The Core Allegations

A Bloomberg investigation in July 2026 revealed that Phia’s browser extension allegedly engaged in a practice known as "cookie stuffing." Researchers and competitors found that the extension would inject Phia’s affiliate tracking cookies during the checkout process on major retail sites. This often overrode existing affiliate codes from legitimate sources like publishers and content creators.

This tactic, also referred to as attribution hijacking, allows a company to claim commissions on sales it did not directly influence. It violates the terms of service for most affiliate networks and merchants, who rely on accurate tracking to compensate genuine referrers.

Phia's Defense and Prior Issues

Phia has responded by stating that the behavior resulted from a December 2024 code change and was not intentional. The company claims the issue was fixed immediately upon notification and the offending functionality removed. Despite these assurances, Impact.com suspended Phia’s account pending its own investigation.

This is not the first time Phia has faced scrutiny. In November 2025, security researchers discovered that an earlier version of the extension transmitted full HTML snapshots of visited webpages to Phia’s servers. This included sensitive, non-shopping pages, raising significant AI shopping assistant privacy concerns, a practice deemed "highly unusual" by experts.

Funding, Celebrity Backing, and Market Context

Phia had raised approximately $45 million in funding, attracting high-profile investors like Notable Capital, Khosla Ventures, and Kleiner Perkins. The company also boasted a significant list of celebrity backers, including Khloé Kardashian, Hailey Bieber, and Kris Jenner, underscoring the trend of substantial startup funding and celebrity investors in the AI space.

These allegations place Phia within a broader context of ethical debates surrounding browser extensions and affiliate marketing. Competitors like Honey and Capital One Shopping have faced similar accusations and legal challenges regarding their own practices, highlighting the inherent browser extension ethical issues.

Legal and Investor Ramifications

As of July 11, 2026, no formal lawsuits or regulatory actions have been publicly filed against Phia, Gates, or Kianni specifically for the cookie stuffing allegations. However, potential legal claims could include breach of contract, tortious interference, and violations of unfair competition laws. Criminal wire fraud charges are possible in egregious cases, though rare for early-stage startups.

While most investors, including celebrity backers, have limited liability, they may face reputational damage and scrutiny over their due diligence. The association with alleged deceptive practices could harm personal brands and future fundraising prospects.

Phia’s situation underscores the tension between aggressive growth tactics and sustainable, ethical scaling for AI consumer startups. Transparency and robust compliance are paramount in navigating the complex affiliate marketing landscape.

Last updated: August 19, 2026

Status Update: August 2026

As of August 2026, no formal lawsuits or regulatory filings have been publicly initiated against Phia or its founders over the cookie stuffing allegations. Impact.com's investigation remains ongoing, and the company has not issued additional public statements beyond its July 2026 engineering explanation. Compliance observers in the affiliate marketing industry have cited the Phia case as a reference point for how platforms are applying stricter attribution standards to browser extension tools in 2026.

StartupHub.ai tracks browser extension-based AI shopping and commerce tools across our startup database. The Phia situation reflects a broader pattern: affiliate-dependent startups face sharper platform scrutiny in 2026 than at any prior point, particularly where cookie-based attribution can be influenced by client-side code executing at checkout.

August 11, 2026: Founders Reportedly Knew for Months

A follow-up Bloomberg investigation published August 11, 2026 significantly deepened the controversy: Phia co-founders Phoebe Gates and Sophia Kianni were reportedly aware of the cookie stuffing behavior for at least seven months starting December 2025, directly contradicting the company's earlier explanation that the practice was discovered only after reporters made contact. The investigation identified Nike and Nordstrom among the retailers whose affiliate programs were affected. Cookie stuffing accounted for approximately 51% of the merchandise value Phia claimed commissions on in June 2026, with average daily affected revenue around $80,000 before the features were disabled. After Phia removed them in early July, average daily revenue reportedly fell to between $10,000 and $28,000, a stark measure of how dependent the business model had become on the disputed attribution. Impact.com confirmed it is redirecting any commissions credited to Phia but not yet disbursed, going back to June 20. Phia is now actively issuing transaction reversals to brand partners and has disclosed it is hiring a compliance head. No criminal charges have been filed as of August 19, 2026.

StartupHub.ai data shows Phia carries a community sentiment score of -67 across Reddit discussions tracked in our database, one of the most negative readings we track for any AI shopping assistant, a signal that preceded the cookie stuffing revelations by months.

What Users Are Saying

Across the Reddit threads tracked in StartupHub.ai's review database, the pattern is consistent: data collection concerns surfaced first, affiliate manipulation concerns followed.

Phia, the AI shopping app founded by Phoebe Gates with dozens of celebrity investors, was previously criticized for collecting a concerning amount of user data. Researchers found that a snapshot of every webpage users visited (bank statements, private emails etc.) was transmitted back to Phia." - r/Fauxmoi, June 2026

I have been a victim of the weird lying/baiting ads for Phoebe Gates and Sophia Kianni's 'ai shopping app' on TikTok. I recently looked the app up, and saw they had raised $30 million for it earlier this month, bringing the valuation to $180 million." - r/nycinfluencersnarking, December 2025

Frequently Asked Questions

Did Phia's founders know about the cookie stuffing before denying it?

According to a Bloomberg investigation published August 11, 2026, Phia co-founders Phoebe Gates and Sophia Kianni were reportedly aware of the cookie stuffing behavior for at least seven months starting December 2025. This contradicts the company's initial response, which framed the issue as an accidental result of a December 2024 code change discovered only after reporters reached out. Phia has not issued a detailed public response to the August 11 report.

What is cookie stuffing?

Cookie stuffing is an affiliate fraud technique where a company inserts its tracking cookies into a user's browser without actually driving the purchase. This lets the company claim commissions on sales it played no role in generating, violating affiliate network terms and potentially exposing the company to breach of contract claims and platform bans.

Is Phia still operating?

Yes. Phia remains operational as of August 2026. Its Impact.com account was suspended pending the platform's investigation, but the app and browser extension continue to function. No shutdown has been announced.

Who invested in Phia?

Phia raised approximately $45 million from institutional investors including Khosla Ventures, Kleiner Perkins, and Notable Capital. Celebrity backers included Khloé Kardashian, Hailey Bieber, and Kris Jenner.

Has Phia faced legal action over cookie stuffing?

As of August 2026, no public lawsuits, regulatory actions, or criminal charges have been filed over the cookie stuffing allegations. The primary consequence to date is Impact.com's account suspension while it conducts its review.

Is this similar to what Honey was accused of?

Yes. Honey, PayPal's browser extension, faced class action lawsuits in late 2024 from content creators alleging similar last-click cookie overriding at checkout. Both cases involve browser extensions inserting affiliate codes to redirect commissions away from legitimate referrers.