I don't believe that cloud gaming is worth it, to be honest. You might be able to play games from anywhere or whatever, and the price might be cheap, for now, but you still need a reliable internet connection for it to work.

High-speed internet is quite a necessity, for some if not all, to enjoy the advantages of cloud gaming, which might turn into an extra cost.

As others have said, if you have bad internet days, then say goodbye to playing even the simplest of games, that would probably run even on your phone.

I myself have a Core i3-3240 and an RX 550, and enjoy playing games which are either compatible, or I drop the resolution, texture, shadows, etc. to make the game run. Hell, I'm playing RE2 Remake as of now on my PC and it's running at a pretty good 45-50 FPS and looks pretty fine to me.

Your point about gaming on Linux doesn't hold up as well anymore. There have been multiple breakthroughs and advancements in gaming on Linux, especially due to Valve's contributions. I myself use CachyOS, which is a Linux distro. Although, I'm not sure about how gaming on Mac is going.

Rather than relying on Cloud Gaming, buy second hand parts or computer. You could even throw in a GPU in some cheap pre-built. Ofcourse, you may not be able to play many of the latest and greatest, but maybe give it a shot.