Earlier quoted context omitted.
If you buy the game, do you actually own it though? Or do you lose it when Stadia shuts down? If I'm going to pay full price for a game, then I want to be able to play it 10 or 20 years from now.
To be fair, this is little different to buying a game on the PlayStation Store or Xbox Store. As soon as those go offline, you will no longer be able to download those games. And so you'll be at the mercy of the lifespan of the hard drive. You won't be able to copy the games to another device as it won't be able to validate ownership.
And so, you'll be at the mercy of the lifespan of yet another Google product.