tatertot: tatertot: Interesting! But not practical without GPU passthrough I think.

Thats for sure, but my purpose is to notify users/developers/fans to use very secure environment like Qubes with Very secure connection and design like Whonix in order to do fun things like playing games. So this is possible as you see but we hope that ppl have the enough awarness to make this happen in GNU/Linux world , instead of doing it in a harmful environment like Windows or Mac.

tatertot: tatertot: Why use whonix-gw instead of over clearnet?

Because GW torify your connection , so when you are playing or using steamOS then your privacy wont be harmed by valve because in the end they are eating their food by selling your privacy.

tatertot: tatertot: I think you have to sign into Steam anyway so they have your real-life identity, regardless of Tor, right?

No, actually you can register anonymously with any email provider like https://anonymousspeech.com/ (or any provider), then register in steamOS with your email.

So the email provider doesnt know who you are nor valve. By this you protect yourself from privacy attacks.