Can they though? Isn’t the responsibility of porting games to Linux that of the developer? They could create a Gamepass for Linux but that would probably entail more money spent on licensing that platform, and funding ports which they certainly have no economic incentive to do.
That being said, they seem really committed to their “everything is an Xbox” strategy so it would not surprise me terribly if they ended teaming up with Valve at some point and created some kind of Gamepass on Steam thing, where you can play Gamepass games directly from steam or something, which would presumably also include the MacOS and Linux versions of the game if they are available.
Oh I know, I’m just not a big fan of sailing the seas these days. But I might just give it a go with the ones I own just to see how they run.