Apples justification for the percentage fee on in-app purchases is due to the app store terms and conditions of use that anyone wishing to use in-app purchases must use Apple's payment system. Not allowing app developers to inform their users of cheaper prices elsewhere was seen as being anticompetitive (the only thing Epic won on) meaning app developers can now put links in their app's to their own websites telling users of cheaper prices/cheaper alternatives but here we are seeing that Apple still intends to charge a percentage fee for app developers to have the privilege of informing their users of cheaper prices elsewhere. So just what exactly is app developers using differently that justifies the fee?, they will not be using Apples payment system so it cannot be that. All they will be doing is putting a link in their app, a link and it be a link that the app developers would have to code into their app. Apple has no involvement anywhere in this but yet they are saying that going to charge a fee for links being added into apps.
Apple's behavior is extremely disgraceful over this. Epic are right and they should take the matter further. We just need to ignore the delusional Apple fans and their rant over Epic.