One thing you cannot deny is that Valve is one of few companies that loves gaming on Linux

Valve is a corporation, what they really "love" is money. All their Linux strategy is simply future-proofing. They know that if gaming kept being restricted to Windows, they could have been destroyed overnight by Microsoft, especially since MS start betting hard on gaming and built their own Steam competitor.

and it deserves a huge credit.

Well, they certainly do. I, for one, am grateful, since I've been using Linux for over 20 years. But I know they're in for the money, and that's ok.