chasm
Incidentally, Apple’s right to collect a commission for the use of the App Store (even if external payment processors were used) has been challenged in a number of countries worldwide, and Apple has won every single one of them.
The stores in your local mall pay rent — they don’t get to use the facilities and convenience et al of the mall for free. Developers using the App Store won’t get to use it for free either, which is why we’ll likely never see Epic let back in (to either the Play Store or the App Store).