I built one of those custom mechanical keyboards with some "fancy linear switches", but I am not a fan of the mechanical keyboard enthusiast community because it is so sanctimonious, elitist, and close minded.
There are pockets of elitism where people are comfortable in their insular group and use it as a status symbol. But there are plenty of welcoming subgroups; it's just that they may take a little digging.
For keyboards, RGBKB, customMK, and Zenclack have been some of my favorite little Discord communities.