Pretty neat, but is there any Windows or MacOS support planned? I wouldn't mind renting out my GPU when it's idle, but I don't really want to go through the process of dual booting etc.
I think you just answered yourself. Some of us like to play games at 4K at 80Hz+, with no subscription fees, no internet bandwidth requirements, no added latency, and ability to mod.
Games that use anti-cheat are a mess on Linux. I don't play any of those games, and if you do then you're likely to run into some trouble with Linux-only.
Short of dedicated hardware (Xbox/ps) I’m not sure what else could be done.