Apple engaged in anticompetitive behavior by charging App Store developers “excessive and unfair prices” for app distribution services, the UK’s Competition Appeal Tribunal (CAT) ruled today [PDF] (via Reuters).

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The Tribunal found that Apple abused its market power by overcharging developers from October 2015 through the end of 2020. Developers were forced into using Apple’s in-app purchase system and had no alternative to paying up to a 30 percent commission during that time period. The excessive fees…