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Phoebe Gates attend as Tiffany & Co. celebrates the launch of Blue Book 2025: Sea of Wonder at The Metropolitan Museum of Art. Jamie McCarthy/Getty Images for Tiffany & Co

Bill Gates's daughter co-founded a shopping app — and it reportedly took credit for sales it didn't make

If you shopped online at Nike, Gap or Nordstrom in the past year with the Phia shopping app installed, there’s a chance it collected a commission on your purchase, even if you never clicked one of its coupons.

Phia is an AI-powered application co-founded by Phoebe Gates, the 23-year-old daughter of Microsoft co-founder Bill Gates, and her former Stanford roommate Sophia Kianni.

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A Bloomberg investigation published August 11 reported that both founders pushed for software features that claimed credit for sales the app didn’t drive. It is alleged they knew about it for at least seven months.

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On July 7, Bloomberg contacted Phia to ask about the problem. The next day, Gates and Kianni’s company publicly said that a software bug was behind the app’s woes and that it had only learned about it “within the last 24 hours.” But Bloomberg’s first story that ran July 9 revealed that Phia’s internal Slack messages go back to December.

How the app was supposed to make money

Phia runs a browser extension that pops up at an online retailer’s checkout. It hunts down discount codes and earns a commission from the retailer whenever a shopper uses said code. It opened background tabs across major affiliate networks.

That action is against the policies of affiliates like Impact.com, Awin and Rakuten. Rakuten’s network policies say the shopper has to click that kind of offer before a cookie is placed, and that merely seeing one doesn’t count.

Proof comes in the form of that cookie, data from the app left in the shopper’s browser history. Phia’s homepage still promises it “automatically applies the best coupon codes at checkout,” and the pop-up carries a “Get coupon” button.

Bloomberg tested the app’s mobile extension on more than 50 websites. At checkout, the app loaded a second tab and dropped its cookie into the transaction, pushing aside the credit belonging to the link that had actually sent the shopper to an online retailer like Nike, the Gap and Nordstrom. Those companies did not respond to Bloomberg’s requests for comment.

Phia’s dashboard listed the behavior as a feature called “enable coupon auto drop.” It was turned on December 10 and left on until July 7, the day Bloomberg called. A second feature, “passive trigger,” ran from October to July, dropping a cookie every two hours on any top-1,000 site where the shopper had previously used Phia.

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What the founders reportedly knew

On December 18, Gates noticed Phia’s commissions from Etsy looked low. In an internal Slack channel, she pressed engineers to confirm the cookie was dropping automatically on every site with a coupon. A developer said the pop-up itself was broken, but that when it did appear, cookies were sent even if the shopper didn’t use a coupon. Gates replied, “Regardless we should capture every transaction if the cookie drop was working.”

When Kianni floated setting a cookie on users who dismissed a Phia pop-up, a colleague noted that Google’s Chrome policy bars affiliate cookies on dismiss events. She agreed, then suggested treating the dismissal as an attempted open and rolling it back if anyone complained.

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By January, Phia announced a $35 million Series A at a $185 million valuation, saying revenue had grown 11-fold since launch. Once those suspected features were rolled back in July, an internal chart shows average daily revenue sliding from roughly $80,000 to between $10,000 and $28,000. A Phia data scientist put cookie stuffing at about 51% of what the app claimed credit for selling that June.

Phia argues the credit-claiming allegations, saying that the 51% figure came from an early analysis using the wrong method, and that revenue fell because it paused most of its money-making features.

Phia has yet to respond to Moneywise’s requests for comment.

Who ends up paying

Shoppers weren’t overcharged at the checkout since the losses land on merchants and rival publishers.

Ben Edelman, an advertising consultant who has spent 20 years investigating what he calls deceptive marketing, wrote in July that forced clicks make merchants pay commission on traffic they would have gotten free, and that every dollar won is a dollar that another publisher loses. Edelman later reviewed Phia’s code for Bloomberg and backed its findings.

Since Bloomberg broke the story, money has started flowing back. Impact.com, the network that routes affiliate commissions, temporarily suspended Phia from its marketplace and told Business Insider that unpaid commissions from June 20 through July 29 are being refunded or reassigned. It didn’t address money paid before June 20.

Phia was able to claim credit for sending shoppers to online retailers because their browsers let extensions read and change the pages they visit. Edelman’s testing found the extension setting on for iOS users and off on Chrome — part of why it ran so long, since fraud testers often check desktop only.

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Godwin Oluponmile is a content specialist, SEO strategist and copywriter with seven years of expertise in finance, Web 3.0, B2B SaaS and technology. His work has been featured in publications such as Entrepreneur, HackerNoon, Blocktelegraph and Benzinga.

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