They've been working on Linux support since at least around the time that Microsoft introduced the Windows Store... so for the last twelve years or so.

And, man, a couple of months ago I figured out how to run Steam as a separate user on my Xorg system. Not-at-all-coincidentally, I haven't booted into Windows in a couple of months. Not every game runs [0], but nearly every game in my library does.

I'm really gladdened by the effort put in to making this work.

[0] Aside from the obvious ones with worryingly-intrusive kernel-level anticheat, sometimes there are weird failures like Highfleet just detonating on startup.

Not everything, but they do invest in it.

And Gabe won't be around forever and the guy is already over sixty. Statistically he's got about two decades left to live and not all of that will be at a level where he can lead Valve.

Old age can make him give that up before death.