An interesting thing to me, and it's got ZERO press or public chatter, is that Nvidia's Nvidia NOW service offers something somewhat comparable to Stadia (at the low end) but has the benefit of allowing you to keep your games if(when) they shut it down.
Basically, it works like Stadia, but you don't buy games from Nvidia, you just use your own Steam/Epic/Origin account to play games on Nvidia's servers, which then stream to your device.
Who knows how good their streaming infrastructure is, or their latency/compression (it's still in beta), but it's an interesting counterpoint to Stadia's offering.
I don't expect Nividia's service to last very long (as it's got no market penetration) but you don't lose anything if/when it disappears.