I bought those games decades ago. Anti-cheating software used to be a lot more tolerable back then. They were still obnoxious malware but at least they were not literal drivers with vulnerability-as-a-service ioctls that give the games and everything else free access to ring 0 from user space. They were also optional, I could find game servers that didn't require the software.
No idea honestly. Been a Steam customer since 2006 and I have almost 300 games. That's why I said I want them to keep this kind of software as far away from Linux as possible. Who knows what their next update will bring into my machine?