This bewildered me - they advertised 4k gaming and then it turned out the vast majority of games were running at like 1080p and being upscaled. Sending 1080p video at 4k seems incredibly wasteful and pointless.
Technically upscaling with machine learning can be amazing, and it's what most real-time renderers use nowadays. You won't be able to tell, and it can even add detail if the network is good. I'm not an expert though, but I suppose it can only get better?
According to this site there seems to be quite a few games that stream at 4K 30fps and 4K 60fps
I also don't like their subscription model, TCO is way too high compared to console. You pay monthly and you still pay full retail price for the games.
I wound up getting Doom for PS4 and it's awesome. The HDR makes it look fantastic.