Phoebe Gates Startup Phia Knew About 'Cookie Stuffing' for Months, Leaked Slacks Show

When shopping startup Phia faced intense public scrutiny over unauthorized affiliate tracking earlier this year, leadership framed the incident as an isolated technical glitch discovered only through external inquiries. However, newly leaked internal communications paint a starkly different reality, suggesting top executives were fully cognizant of the operational tactic months before public exposures took place.

Quick summary

• Leaked internal Slack messages show Phia co-founders Phoebe Gates and Sophia Kianni discussed cookie stuffing tactics with executives and engineers as far back as December.
• Reporting indicates the cookie stuffing mechanism was an intentionally engineered feature that could be toggled on and off, rather than an accidental technical bug.
• Disabling the cookie stuffing code triggered a sharp drop in Phia's daily sales, heavily impacting affiliate revenue streams tied to major brands like Nike and Nordstrom.

Why it matters

The controversy surrounding Phia hits at the core of digital marketplace ethics and affiliate marketing governance. Cookie stuffing artificially diverts affiliate payouts away from legitimate publishers, influencers, and digital marketers who genuinely influence buyer decisions. By dropping tracking codes onto user sessions without genuine user engagement, platforms violate standard network contracts and skew sales analytics for enterprise brands.

For consumers and retail partners, the situation illustrates how growth-at-all-costs mentalities in VC-backed startups can compromise user trust. When e-commerce aggregators engage in clandestine revenue-generation tactics, enterprise retailers like Nike and Nordstrom face unearned financial payouts while consumers remain unaware of how their browsing sessions are tracked and monetized.

Background

Phia made its public debut with significant media attention, co-founded by Phoebe Gates—daughter of Microsoft co-founder Bill Gates—and activist Sophia Kianni. Positioned as a price-comparison search engine akin to Google Flights for retail shopping, the application claimed to help consumers locate the best online deals across various consumer brands.

However, operational headwinds emerged quickly following its launch. Previous reporting by Puck highlighted that Phia lost nearly half of its full-time workforce within months due to organizational friction. Furthermore, the platform faced backlash after multiple consumer brands discovered they were listed within the app without prior consent or partnership agreements. Early technical reviews also raised alarm bells regarding data privacy, discovering that the app was covertly collecting extensive user tracking data and routing it back to central servers.

The central crisis deepened when an investigation by Bloomberg exposed that Phia was systematically claiming affiliate referral credits for online purchases it had not actively facilitated—a practice strictly forbidden under enterprise affiliate agreements.

Unpacking 'cookie stuffing' and the technical architecture

In digital retail ecosystems, affiliate networks use tracking cookies to attribute online purchases to specific recommendation platforms. When a shopper clicks a legitimate referral link, a tracking cookie registers the transaction source, granting the publisher a small percentage of the resulting sale.

Cookie stuffing subverts this system entirely. Instead of waiting for a deliberate user click, a compromised application or browser extension automatically deposits affiliate tracking scripts onto a user's browser behind the scenes. When that user subsequently completes a purchase on a site like Nike or Nordstrom, the shopping app takes credit for the conversion, siphoning commission fees away from genuine marketing channels.

While Phia previously represented the issue as an unintentional software error, leaked Slack records reveal that the mechanism was designed as a manageable feature. Internal communications indicate that engineers and executives held the ability to actively switch the cookie stuffing code on or off, confirming the architecture was deliberate rather than systemic malfunction.

Internal Slacks vs. public defense: A timeline of disclosures

The divergence between Phia's official public statements and its private communications forms the focal point of the current findings:

• December: Leaked internal Slack channels reveal active discussions involving co-founders Phoebe Gates and Sophia Kianni alongside key engineers and executive staff regarding cookie stuffing operations.
• Early July: External investigative reports spotlight Phia's illegal commission collection. In response, a Phia spokesperson publicly labels the practice a technical bug, insisting leadership only became aware following reporter inquiries.
• Subsequent Investigations: Follow-up reporting reveals that disabling the tracking code caused an immediate, sizable drop in Phia's daily revenue, confirming that unauthorized affiliate credits accounted for a substantial portion of the startup's total intake.
• Current Response: Addressing the leaked Slack revelations, a company representative rebuffed certain claims while stating that the team intends to learn from the experience.

Operational fallout: Revenue drops, executive churn, and investor reaction

The financial consequences of turning off the cookie stuffing feature highlight how deeply dependent the startup's business model had become on unauthorized affiliate claims. Prior to shutting down the script, cookie stuffing comprised a major share of Phia's generated sales volume. Once deactivated, daily intake shrank dramatically, raising fundamental questions about the startup's underlying organic traction.

This revenue collapse coincided with heightened internal instability. Reports indicate that key venture investors became increasingly unsettled by the startup's reliance on aggressive affiliate tactics. Combined with significant employee departures and privacy scrutiny, Phia now faces a daunting pathway toward regaining credibility within both the technology sector and retail brand networks.

Qnews24h insight

The situation unfolding at Phia provides a stark case study in the dangers of high-visibility founder hype outpacing operational compliance. While celebrity co-founders can command substantial initial media interest and investor capital, pedigree cannot shield a venture from the regulatory and contractual standards governing digital commerce.

In the competitive e-commerce aggregation sector, short-term revenue hacks often create an illusion of rapid product-market fit. However, when financial growth relies on engineering shortcuts that breach merchant partner terms, the resulting reputational damage is rarely recoverable. Moving forward, early-stage consumer tech platforms must recognize that transparency in affiliate partnerships and user data collection is not merely a legal requirement—it is a core prerequisite for long-term venture viability.

Sources

• TechCrunch: Phoebe Gates and Sophia Kianni reportedly knew Phia was 'cookie stuffing' for months
• Bloomberg: Investigations into Phia affiliate marketing practices and internal communications
• Puck: Reporting on Phia staff turnover, unauthorized retail listings, and investor sentiment

Frequently Asked Questions

What is cookie stuffing in digital marketing?

Cookie stuffing is an unethical technique where a website or application attaches third-party tracking cookies to a user's browser without their active involvement. This tricks affiliate networks into recognizing the app as the original referral source for a purchase, granting it unauthorized sales commissions.

How did Phia respond when the cookie stuffing was first reported?

When initial reports emerged, a spokesperson for Phia claimed the startup only learned of the issue upon external inquiry and characterized the unauthorized tracking behavior as a technical bug.

Which brands were affected by Phia's affiliate practices?

Major retail brands including Nike and Nordstrom were among the retailers affected by Phia's affiliate commission tactics.