GeForce Now allowed me to play the games I already own with a more powerful machine than I could buy myself, for just $10/month. Artifacts were noticeable but not enough for me to care. If I bought my own gaming PC later, I would be able to continue playing the game there. GeForce Now offered "Hey, you're playing Cyberpunk at 720p@25fps? Wanna play at 1080p@60fps for $10? And you can leave any time" And I said heck yes.
Stadia would have denied me the ability to continue playing on my own machine while charging me even more money. There are a bunch of stories of people with saved games trapped in Stadia. Google made no attempt to be better than the competition. It's like they're unaware of anything other than themselves.