That’s how taxes work, yes, and I consider them valuable. There’s a lot of work in actually deciding what work needs to be done, finding the people to do it, negotiating prices, things like that. So yes, I do think “the Lord” is adding a lot of value and making the whole operation possible in a way that probably wouldn’t work if you had everybody just trying to agree on how to spend the money and split the costs.

I will also point out Valve provides not just the platforms, but also some libraries for game development, including a networking library with NAT punchthrough (which is why on steam you can right-click a friend and join them, even on small indie games, without the game devs hosting their own servers for that) and a library for input handling (though less mandatory, but if used it makes input remapping in steam better integrated).

Another thing to note is that the value provided can be experienced more directly - if you want to try a great website/store that, to my understanding, doesn’t take any cut while providing hosting, try playing some games from itch. Depending on your gaming habits you might not notice much of a difference, and more of your money would go to the devs, but you might sorely miss some features like cloud saves, steam networking, steam input, proton, automatic delta/incremental updates.