I never had an Apple product and probably never will. On the other hand I am full of free games from Epic store.
Having said that, here Epic is wrong. You can't ask for the freedom to do business as you please in someone else's store. It's not your store. You didn't created it, you didn't advertise it, you didn't promote it, evolve it, support it. You don;t pay the stuff working in that store. And it's not yours to impose what you might advertise as freedom and rights.
Also at least on Android someone can install apps from other sources, outside of Google Play. Epic can create their own store and sell their games from there. They can keep selling through Google Play and just have 30% cheaper prices at their store. If Google forces on users the usage of Google Play, then yes. You can say there that Epic does have a point. I don't know what is going on on iOS, but I guess Apple Store is not the only way to install apps.