Definitely yes, but let's not kid ourselves. Valve is not doing this from the generosity of their hearts or love for the Linux community, or the gaming community, but Proton and the Steam Deck are their future insurance policy against Microsoft coming after their profits in the future.
The writing was on the wall, they saw how much money Epic was giving to Apple, and how many studios Microsoft owns, and with the direction Windows is going, in 10 years when Windows 12 drops, Microsoft could also push for a 30% cut on all Steam sales on Windows for example, and Valve is preparing themselves for such a scenario by pushing Steam to Linux full throttle.
They want to make sure they reap all the profits from the Steam store and not have to share they pie with a middle man like the Epic vs Apple kerfuffle. That's the end-game here.
Don't get me wrong, I'm still very grateful for what Valve is doing for Linux, but it's important to be aware of the motivation behind the actions, consider their potential end-game, and not get romantically attached to companies as there is no free lunch and companies are not your friends.