there is a couple ideas here that I think are cool. how you can jump into someones game and watch them playing it before buying it. You can cheer them and stuff like that. (could be good for content creators)
it's just fascinating looking at some of what it has to offer and what can be extrapolated from it into stadia.
https://www.reddit.com/r/Stadia/comments/e2e2jh/onlive_former_users_what_do_you_think/ saw that over here agree with the majority of them, it was way ahead of its time something stadia should definitely look into.