What I am getting at is that you are using another billionaire's disingenuous talking points uncritically while thinking you're being anti-billionaire. You heard something that sounded good but didn't verify or research any of it.
This whole idea of "Steam takes 30%, that's terrible!" is from Tim Sweeney's anti-Steam PR campaign. The 30% cut was always the standard retail cut, and has been part of every retail store until EGS made a big thing about their lower amount and their disingenuous PR campaign that suggested that only Steam was taking an exorbitant cut. The fact is that all stores took that same standard retail cut. Steam makes a bajillion dollars more than everyone else just from the sheer volume of sales they do. The idea that they make all this money because they take a bigger retail cut is a lie.
And, in case this hasn't been made clear enough to you yet: you don't seem to know what Steam is if you think it's only a service to download games and doesn't offer anything else to users. It has a huge amount of features for users, games, and communities beyond just that, far more than another other retailer or store is offering. It is completely disingenuous to pretend like Steam does none of these to force the argument that they are just taking money and offering the most basic of a singular service. So if you want to argue that Steam specifically doesn't deserve the 30% cut that every retailer takes, then you'll need to demonstrate how Steam offers less than every other retailer. If this requires ignoring all the features and advancements Valve and Steam have done, then that really shows the quality of that statement, doesn't it?
Taking a step back to assess situations fairly and accurately isn't a defense of anything. There's so much to criticize Valve and Steam for if you took the time to be informed, most notably with the lootboxes and gambling aspects (which is also where much of its profits come from). So if you're really as anti-billionaire as you claim to be, are you going to go and examine these assumptions you held and figure out why you got misled so deeply by another billionaire, and make sure it doesn't happen again?