> if it were possible to migrate Steam purchases to the Epic Store
Not necessarily migrate, but offer (for free) the same game on Epic if you already have it on Steam; GOG did this for a few games (not that it helped GOG).
GoG does it for a small, rotating selection of titles, which is good. But for it to make a significant difference, they'd need to be able to move a large majority of people's libraries. That's much harder, given the variety of developers and publishers you’d need to strike deals with. I don’t think it’s feasible, sadly.
I wish EA (and other distributors) did something like GOG Connect. IMO I'd be less annoyed if Epic offered something like this for current Rocket League owner in order to keep the userbase as big as possible before they ultimately split it in two.
Not necessarily migrate, but offer (for free) the same game on Epic if you already have it on Steam; GOG did this for a few games (not that it helped GOG).