If Apple buys it, it'll quickly head down the path of exclusivity. They'll find some "security" excuse for it that'll be enough for their reality distortion field to do its thing.
(I think there are a few on Apple Arcade, but I always assumed those were sponsored exclusives?)
As far as bigger studios go, Bungie was a Mac studio until Microsoft scooped them up to turn Halo Xbox-exclusive instead.
But if you are talking OSX exclusive, yeah, that would be kinda insane.