At this point, their cut is just about mathematically fair, given how little value customers get from buying games most other places and how much value they get from Steam. Then that money got funneled back into decoupling PC gaming from Microsoft and making probably the only mass produced handheld gaming system that’s open enough to let you opt out of their ecosystem. I’d be really curious as to how many games on Steam even have ARM builds, because I’ll bet it’s a very low number, and that would likely make the juice not worth the squeeze.