Though do any of those do the Stadia model of having you "buy" the game specific to them to be able to stream it? Other systems I'm aware of mostly piggyback o

Though do any of those do the Stadia model of having you "buy" the game specific to them to be able to stream it? Other systems I'm aware of mostly piggyback on some other platform so your "ownership" extends to local usage also (like how Nvidia's system works with your Steam library), or are just Netflix-esque subscriptions that give you access to the available library as long as you're subscribed (like PlayStation Now, well, whatever it's now called under Plus, and Game Pass streaming). Neither of those models has the same type of concern over losing your purchases. Google's track record is obviously a factor too, but the business model is as well.