That’s true, and I completely despise both billionaires and yachts, but still I’ll only buy games through stores that tread my preferred OS as a first party, and currently only steam does that.

In my case Valve definitely deserves a cut, as I’m only buying the game because steam makes it really easy to play it on linux.
Their work on drivers and proton is what makes me buy the games, because if I have to tinker just to play on my preferred OS, I’ll tinker with pirated versions instead.