On a typical Tuesday morning, a small business owner in Lagos or Lyon logs into an advertising dashboard, studies what appears to be a fair, competitive price for a sponsored listing, and pays it without question. According to the United States Federal Trade Commission, that price may have been a fiction — one quietly engineered by Amazon itself. The FTC has filed a complaint alleging that Amazon manipulated its own advertising auction system in a scheme regulators are calling "Project Nessus." The core accusation is striking in its simplicity: when Amazon's internal auction produced a winning bid, the company allegedly did not honour that result.

Instead, it is claimed to have substituted a higher price of its own choosing — one that bore little relationship to what advertisers had actually competed for. The auction, in other words, was said to be a performance staged for sellers while Amazon collected the difference. The implications reach well beyond American shores. Amazon's advertising business, which generated roughly $56 billion in revenue in 2024, serves merchants in dozens of countries — from Germany to Japan to Brazil — who rely on the assumption that programmatic auctions are neutral.

If regulators are able to prove their case, it would suggest that one of the world's most trusted commercial infrastructures was, in effect, a toll booth with a hidden surcharge. The FTC argues that this practice amounts to an unfair method of competition, violating federal law. Amazon has disputed the allegations, and the case will now move through the courts.