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Epic win: Jury decides Google has illegal monopoly in app store fight
(www.theverge.com)
This is a most excellent place for technology news and articles.
I believe that is the crux of it. And apparently part of the trial exposed that some big players have special deals such that don't have to pay those in-app purchase commissions, or at least have a smaller commission. And that's what makes it an abuse of their market position.