Copyright laws are bullshit that long lost its original purpose. Now it's just a tool for big companies to extend their greed. I will keep using cracked software as I've done for many years. If you're on some security critical job, sure get legit software. But I'm just a no name NPC, none of the stuff I do require that level of security. As for the original question, from what I can find out is that you can't do it on Steam OS because it's pretty locked down. You can run cracked Windows version of games by using Proton GE though.