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.
The issue is not the launcher. The issue is the exclusivity. It demonstrates an anti-consumer mindset. The GOG, which people here have demonstrated acceptance of, is yet another launcher, the launchers less elegant to steam, and everyone is just fine with.