Exclusives suck for everyone. Especially when Epic started out, they only had payment processors in certain countries. This meant that some people literally had no legal way to play the Epic exclusives. I'm not sure where they stand today, but that annoyed me enough, along with other shenanigans by Epic and Sweeny, that I avoid the whole ecosystem.
That may be. I do remember somewhere in a documentary that they kept re-developing stuff for different libraries/technologies. I think at least one was voluntary. I can't recall which doc this was, though.