I have a couple of games for the Switch (Warframe and Tetris 99 off the top of my head) that you can only play with an active internet connection. so when I'm on the train to and from work I simply can't play them unless I make my phone a hotspot, which I don't want to do as I don't want to get killed on my phone bill. if all the Stadia games require an internet connection then they aren't as available to play wherever you are as advertised. also, if playing games requires a lot of data who's to say your ISP won't throttle down your speed/service when you start consuming way more media over the internet than normal? there are legit concerns with this model, but if they can pull it off it could be pretty interesting.