1) They engage in anti-customer behavior by buying exclusives. They don't fund exclusives, they buy exclusives after they've been completed.
2) If they can't get an Indie as an exclusive, they don't want it. They don't want to compete with Day and Date releases.
3) Their war chest is funded by gambling mechanics, mostly gambling mechanics which are actively aimed at minors. While I can understand arguments for "parents should parent" and "adults should be allowed to adult", Epic is based out of the US, and gambling is largely controlled within the US.
4) EDIT: Oh, and their weaponizing their minor-heavy userbase as well against Apple - their trailer and anti-apple skins are being promoted in Fortnight (Rated T by the ESRB).
So yeah. Hate Apple all you want - there's plenty there to hate. But don't let your hatred of Apple push you into backing Epic.