Epic wants to ship 'Epic Payments' as a built in and trivial to enable feature in every Unreal built game which I'm sure would give a much higher cut to devs which in turn would drive higher and higher %s of devs for IOS to their engine.
This is Apple trying to ward off a business model they consider parasitic and destructive to a large chunk of their app store revenue.
What a world we live in where running code on a computer without giving a third of your revenue to that computer's manufacturer could be considered "parasitic" by anyone.
This is demonstrably untrue (from Hey.com to Netflix/Amazon and in between there’s plenty of ways to not give up 30/15% of your revenue). But even if it were true, it’s the same world that didn’t largely have computers in people’s pockets 15 years ago, and that then involved cell phone network operators defining 100% of the installed content on those computers. So this is one of those things where you can be as irate or happy as you want to be.
This is Apple trying to ward off a business model they consider parasitic and destructive to a large chunk of their app store revenue.