Most developers won't care unless they have their own store.
If I'm sony and want my games to stay on PlayStation that fine.
If I'm a indi game dev (or one who isnt owned by MS yet), I want my game to be cross-platform to maximize potential sales, great. In 2 years, if one my PlayStation sales wants to jump to Xbox, they're unlikely to re-buy my game again. They'll just forget about it or pirate it, so I'm not really loosing a sale.
For a lot PC software, you buy a license from the developer directly and if they offer a cross-platform software, they dont care if you're on windows or mac. They might care about how many activations you have, but that's about it. There is no app store middle man.