Not surprised by that decision…
EPIC Games tries to appeal as much developers as they can.
I remember Quantic Dream Games being exclusive to the platform for a year before arriving on Steam 
Plus, it will allow them a good amount of cash that will allow them more resources for the game development and else.
However i’ll wait the Steam release to get the game. As explained in my Detailed Review i wasn’t planning on preordering this sequel anyway after the disaster that was HITMAN™ 2 preorder and launch.
Also, releasing the first two games on Steam then the last game of trilogy on another platform is not a very clever move in my opinion
Anyway wishing them good luck with Epic, and cya in 2022 maybe 