[PeterisP]

I'm not sure if this is a big enough market, but system exclusive games would be a reasonable cause.

For example, a gamer playing on PC and/or XBox might want to play Horizon Zero Dawn for some time, but not buy a PS4 just for one game. Or some Nintendo exclusive game.

Most people don't have all gaming consoles available, and exclusives are (IMHO sadly) a thing, and this might be a reasonable workaround to provide compatibility.

[asymptotically2]

How would a Sony or Nintendo exclusive be on Stadia?

[odessacubbage]

part of the problem with that market is that there are very few true console exclusives left and that trend seems to only be going one way. sony made sure to have their mark all over death stranding and it's still gonna be on pc in a few months.