Every company who takes a cut from in-app purchases, be it subscriptions or DLC, should be kneecapped by this ruling.
It's one thing for the hosting marketplace (App Store, Steam, Play Store, etc) to take a cut from the initial purchase of a game/app. But it's a whole other issue for that initial marketplace to keep reaching further into the dev's pockets and take a cut from in-app purchases unrelated to where it was originally obtained.

Google itself started in 1998, and launched their ad stuff in 2000. They've essentially always been an advertising company.
Sweet, sweet analytical data....