If you gotta say 'Epic', it probably isn't.
No Mutants Allowed
Walpknut
Altho, they might try to pull a fast one and include in ToS of their Unreal Engine that the games developed with it have to be sold on their store exclusively, which would be really scummy.
HydroFlame
I only know Gears of War and Fortnite, and even then only when I Googled them. I have heard of literally none of their other games. They have one called Jill of the Jungle. Huh?