I don't know. They haven't done as much with UE or any other tools, outside of actually charging for non-games (I'm honestly surprised that the Mandelorian was able to be made with no kick back to Epic at all).
Historically Epic has been relatively lenient for how it taxes developers. Say what you want about Sweeny and Fortnite and the Games Store, but I can definitely tell he still takes pride and empathizes with being in the gamedev trenches once upon a time. Can't say that about too many other gaming execs of today.