It seems like this would be an excellent use of all that Stadia tech they built up. I'm pretty sure full YouTube integration was part of the bigger picture for Stadia. Such a shame to see the whole project just seemingly scrapped.
But with the selection of what are effectively just mobile games, I have to ask: why? Why not just... play the actual mobile game?
Why? The purpose of this is to let you know if an app is spying on you.