The Epic First Run programme allows developers of any size to claim 100% of revenue if they agree to make their game exclusive on the Epic Games Store for six months.
After the six months are up, the game will revert to the standard Epic Games Store revenue split of 88% for the developer and 12% for Epic Games.
gog can do the same but I kept having issues with the plugins for each launcher randomly crashing and signing me out and it just got so annoying to use