I’d had luck with Genshin Impact getting to work with Steam Deck. Sometimes some update interrupted it, but just required being patient a few days for people to figure something out. Obviously don’t want to spend money of course, since bans are a risk as you said.

I do wish they would officially support Linux though. As user base grows maybe some day. I wish other handheld other than Valve were coming with some Linux variant than just Windows. Either way, being Steam verified has been something more devs have been trying to get which is good for Linux gaming.