Earlier quoted context omitted.
If we disregard the app purchase (which few complain about) and focus on in-app purchases now. E.g. for buying fortnite hats or netflix subscriptions, where the in-app purchase is NOT processed by apple, surely that can't give rise to any kind of added costs for apple (customer support, transaction costs)?
In-app purchases are processed by apple as well.
Epic would like to proccess these themselves. They dont want apple to turn on their economic output. When you charge money for the work others do -- that's like communism.