I thought I had to buy Stadia to Pro to play any game. This isn't the case. There was a game I wanted to play, it doesn't run on Linux, I bought it 50% off on Stadia and I'm a happy user. I'm not going all in on Stadia of course; I realize that there's a good chance Stadia will disappear eventually. For the convenience and quality I'm getting now I don't mind buying this game on Steam again later if it happens that Stadia is gone and I want to play it again. For the right use case I recommend Stadia.