The Federal Trade Commission says Amazon overcharged advertisers by $20 billion, according to Bloomberg Technology. Bloomberg reports that the claim is part of an FTC lawsuit accusing the e-commerce company of overcharging advertisers. The available material does not describe the period covered by the alleged overcharges, the fee structure at issue, Amazon’s response, or what remedy the FTC is seeking. Bloomberg frames the fight over advertising fees as the latest clash between Amazon and the FTC. For now, the concrete takeaway is the scale and target of the allegation: a federal regulator is challenging Amazon’s advertising-fee practices and attaching a $20 billion figure to the alleged overcharge. That number is large enough to make the case material for investors, advertisers, and operators who depend on Amazon’s marketplace and ad systems. Bloomberg’s Tech In Depth newsletter says reporter Spencer Soper is examining the lawsuit. Further details will need to come from the complaint, subsequent court filings, Amazon’s response, or additional reporting on the mechanics of the alleged overcharging. Who benefits: Advertisers that paid Amazon ad fees stand to benefit from greater scrutiny of the fee practices, though the provided item does not state whether the FTC is seeking refunds or other relief. Who's exposed: Amazon is exposed to legal and regulatory risk around its advertising-fee practices. The available material does not include Amazon’s response.