While I don't have a issue with the Epic Store in general I do however don't like their tactics around exclusives but I have a alternative strategy that you could try to take advantage of Epic's spending spree. Instead of a exclusivity deal maybe try having them sell the game at a permanent discount and have them cover the difference of what you were going to make if that copy was sold on steam. So if the Steam version was $50 and the Epic version was $20 then Epic would give you the $30 you would have made if it was bought on Steam.