The move is designed to make more titles Epic Games Store exclusive…
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.
I think they should double their offer and keep the duration adjustable:
Be one week exclusive, get 100% for two weeks,
Be one month exclusive, get 100% for two months.
Then, it becomes a game for the publisher. Launch on Epic and if there are no transactions, abort after one day. But if there are sales, hold on a bit to pocket the 100%.
Publishers will gamble and stay on Epic a bit longer to get better percentages from the strongest fans but they have to end exclusivity to capture the entire market.