I tried it a few times by curiosity and it indeed works rather fine for what it is, and certainly better than the videos I've seen of people showing input lag on Destiny+stadia.If Steam released a similar streaming service where you'll be able to play the games from your library AND play them locally if you so desire... That would end all of them
That's what Geforce NOW does, the Nvidia streaming service. It's been in beta for around 2 years in its current state, but it lets you play your Steam games through their Nvidia Shield android box or a PC if you're registered in the beta. I've had it for a couple of years and it's a shitload better than I'm reading about Stadia. Mind you, I don't play degenerate online games like Destiny 2 on it though.
NVIDIA also brings real performance to the table :
https://blogs.nvidia.com/blog/2019/08/19/geforce-now-pc-gaming/
At our GPU Technology Conference earlier this year, we announced RTX Servers. Starting today, we’re beginning their rollout. Gamers in Northern California and Germany will be the first to take advantage of GeForce RTX performance. Over time, we’ll expand to our data centers throughout North America and Europe, enabling next-generation gaming in the cloud.
A far cry from the medium settings performance of stadia. Between that and the way GFNow works (bring the games you already own for real instead of buying something you may not be able to access in the future) there's just no comparison.
Unfortunately, as bad as Stadia is, it's a google product so it's going to see a ton of shilling no matter how bad it is compared to even other streaming alternatives. And I don't think NVIDIA is going to really compete on that front, the beta seems like something they do to test their cloud infrastructures more than a real project to commercialize it. Competing for users against Google, Microsoft and Sony also seems difficult.