Steam policies are against everything linux stand for. It's a closed source third party launcher where they rent games under DRM and steal all sort of data while doing so. Valve created a small monopoly in wich videogames makers are abducted in routing their games through their useless launcher to get some visibility. They also abducted people to install their proprietary app to play certain games.
Microsoft owns github and google run android. They have worked and invested a lot in open source projects except they do it only out of convenience and it's just a fraction of what they actually do. Making proprietary software available for linux only extend companies reach.
If a bunch of goons come to take your house and you fight them off, you are defending yourself. If the government decides to expropriate your house and you fight them off you are a criminal.
Unity is a game engine, Steam is some bullshit market place that locks other software behind all sort of junk like drm. As far as i know Unity doesn't promote gambling to kids
As a human being i think you have become incosistent and unreliable too. Lean history, see what's happening around you, think with your own brain.
https://en.wikipedia.org/wiki/Operation_Gladio