Epic Games Store is offering developers 100% of revenue for six months of exclusivity
(www.videogameschronicle.com)
Other posters seem to forget that competition is very important for this kind of thing.
Sure it's annoying when Epic stops games releasing in other platforms, and especially how the epic launcher and it's games do not support Linux.
But without competition, steam can continue with an insanely high cut of indie game sales, and that is NOT ok.