Not sure if anyone really has that much overview to be in all the communities where people care about their input devices.
At least for my circle of friends and acquaintances, most of the mechanical keyboard fans are either programmers or sysadmins or students (and those usually study either computer science or another science or engineering subject).
I also know a (console) gamer who doesn’t care that much about keyboard switches or key caps and prefers a gamepad for gaming (and uses a Sun keyboard at work). There’s though one friend who’s a (PC) gamer and does have a mechanical keyboard (but IIRC a stock one, either DasKeyboard or Razer or Corsair or so).
Regarding myself, I don’t consider myself to be a gamer¹ but a (Unix) sysadmin with programmer tendencies; hence doing a lot on the command-line. (X11 is primarily a terminal multiplexer for me. ) Together with a friend I also wrote a book and occasionally write articles in Linux-related IT magazines, so I also write longer texts.
I found the mechanical keyboard scene, because one of the local meetups took place at the hackerspace of the local chapter of the Chaos Computer Club (CCC; of which I’m a member).
So from my point of view, for quite a while mechanical keyboards have moved along from just being a thing in the gamer scene, especially if you also look at the overlap with the vintage computer/keyboard scene.
Actually my gut feeling is that the mechanical keyboard scene rather hates mechanical keyboard brands which are specifically gamer-targeted, especially Razer. Not sure about how much this also counts for Corsair or DasKeyboard. Ducky seems to be well accepted, though. At least over at r/MK, a Razer keyboard seldom gets much upvotes.
Which again tells me that the mechanical keyboard scene doesn’t want to be mixed up with the gamer scene, and the people in the mechanical keyboard scene don’t want to be seen as gamers.
¹) except occasional point and click adventure (for which I prefer thumb-controlled trackballs) and maybe then and when old FPS games like Doom and Duke Nuke'm 3D on vintage hardware. :-D