Valve is a wonderful contributor to Linux. Look what a beautiful wooden horse they have gifted to us!
Valve is a capitalist company, aiming for profit.
They were heavily involved into establishing DRM in the video gaming world.
They were among the first to establish “FreeToPlay”, Lootboxes and whaling, a predatory business tactic.
They accepted right wing extremist games in the past.
They have a kind of monopolist web store for PC games.
They are known to use the embrace and suffocate tactic against community projects in the past (DotA, once a community driven project is now a trademark of Valve).
The linux gaming scene is flourishing, but this comes at the price of dependency. And not all this dependencies can be resolved at the will of the community; many of the users that came over in the last time are probably unable to start a binary without help.
I think you have a lot of valid arguments for why Valve isn’t a pure champion for all things good. But, that also wasn’t the question.
I’ve used proton more often than not with games purchased through GoG. Their contributions to wine and the layer on top is excellent. Sam Latinga is a Valve employee and creator of libSDL, which is also another significant and foundational contribution to FOSS.
A company can do a lot of good without having to be exclusively good. And as for Linux gaming, it wouldn’t be where it is without Valve.
Its a Private Company which is not focused to gain Profit because Investors push to. That is true for literally every other company that has Investors.
Valve has a Money Machine and mostly don’t care for the next big Profit. They create creative things and behave human in my Opinion.