Epic exclusives have generally been provided in the form of a revenue guarantee on projected sales, I believe. Essentially, they're not paying much of anything

Epic exclusives have generally been provided in the form of a revenue guarantee on projected sales, I believe. Essentially, they're not paying much of anything if the game is successful and profitable on it's own, but if it tanks, the developers still get paid as if it did not. For an indie developer, this basically means worrying about whether the game will succeed a non-issue prior to launch.