What a ridiculous thing to say.
1) You make it seem like Apple are some capricious God like entity that any moment will completely change the underlying terms and conditions you agreed to when running your business in iOS. Its simply not true. If you remove this one situation with Epic its literally never happened.
2) Consumer trust in Apple flows onto any company that is on the iOS platform. You expect Apple to give this away for free? It provides immeasurable benefit to most businesses insofar that a consumer is far more likely to purchase goods or services knowing that Apple have 'vetted' you simply by being on the iOS platform. By Apple being so strict and stringent on App Store requirements you know as a consumer they aren't doing things in the interest of the vendors which in turn benefits legitimate vendors.
3) Epic flagrantly violated the terms they had previously agreed to simply because they don't agree to the 30% cut. That style of negotiation is absolutely atrocious and Epic should be the ones being punished not Apple. If they felt so strongly about Apple's anti-trust liabilities they could have formed an alliance with other businesses and lobbied governments globally without breaking existing T&Cs. They probably would have won too and been able to get the cut Apple take to the same level that it costs Apple to run (say 15%). Instead they are trying to bully Apple into doing something that benefits Epic and Epic alone.
Epic are 100% in the wrong here.
Note I am neither an Epic nor Apple user.