Phia, the shopping startup co-founded by Bill Gates’ daughter Phoebe Gates and climate activist Sophia Kianni, is facing serious allegations of ‘cookie stuffing’ – a deceptive practice that let the company pocket affiliate commissions on purchases it never actually influenced. The accusations, detailed in a Bloomberg investigation, raise questions about the 18-month-old startup’s business practices and could shake confidence in the celebrity-backed venture that’s been positioning itself as a curated shopping platform.

Phia is in hot water. The shopping startup co-founded by Phoebe Gates and Sophia Kianni stands accused of cookie stuffing, a sketchy affiliate marketing tactic that basically amounts to stealing credit for sales you didn’t earn. According to a Bloomberg investigation, the company used this practice to rack up commissions on purchases it had nothing to do with.

Here’s how cookie stuffing works: Instead of earning affiliate fees the honest way – by genuinely influencing a customer’s purchase decision – the accused party secretly plants tracking cookies on users’ browsers. When those users later buy something from a retailer, the stuffed cookie claims credit, overriding any legitimate affiliate who actually drove the sale. It’s like cutting in line at the last second to grab a prize someone else earned.

For Phia, a platform that launched in 2024 with the promise of curated shopping recommendations, these allegations are particularly damaging. The startup traded heavily on the credibility of its founders – Gates, daughter of Microsoft co-founder Bill Gates, and Kianni, a prominent climate activist who founded Climate Cardinals. That pedigree helped Phia attract attention in a crowded e-commerce space where trust is everything.

The timing couldn’t be worse for the affiliate marketing industry, which has been fighting to clean up its reputation. Major affiliate networks have been cracking down on fraudulent practices, and retailers have gotten savvier about monitoring their partner programs. Cookie stuffing isn’t just unethical – it can violate terms of service with affiliate networks and potentially run afoul of consumer protection laws.

What makes this especially messy is that cookie stuffing hurts multiple parties. Legitimate affiliates – bloggers, content creators, comparison sites – lose commissions they rightfully earned. Retailers end up paying for customer acquisitions they didn’t actually get. And consumers have tracking cookies planted on their devices without consent, raising privacy concerns on top of the fraud issues.

Phia hasn’t publicly addressed the allegations yet, but the startup will need to respond quickly. Affiliate networks typically have zero tolerance for cookie stuffing, and partners caught engaging in the practice often face immediate termination. The company could find itself cut off from the very commission structures its business model depends on.

The broader startup ecosystem is watching too. High-profile founders don’t get a pass on ethical violations, and investors are increasingly gun-shy about backing companies with questionable practices – especially in consumer-facing categories where reputation is currency. Gates and Kianni built their personal brands on authenticity and social responsibility, which makes these allegations all the more striking.

For the affiliate marketing world, this is another reminder that the model’s vulnerabilities remain. Despite years of efforts to combat fraud, bad actors keep finding ways to game the system. The difference here is that the accused isn’t some fly-by-night operation – it’s a well-connected startup that should have known better.

Retailers working with Phia will now need to audit their affiliate data to see how much they’ve potentially overpaid in commissions. Some may demand refunds. Others might quietly end the partnership. Either way, the Bloomberg investigation has put Phia’s business practices under a microscope at a critical growth stage.

The cookie stuffing allegations against Phia represent more than just a PR crisis – they’re an existential threat to a startup built on trust and curation. If the accusations hold up, the company faces potential banishment from affiliate networks, damaged retailer relationships, and a credibility gap that even celebrity founders may not be able to bridge. For now, the ball is in Phia’s court to either refute the claims with hard evidence or own up to the practices and explain how they’ll make things right. In affiliate marketing, there aren’t many second chances.