Matrix, Lemmy, and many others exist, work well, are free from centralized control, and are well-known to the crowd that frequents this place. And yet users prefer to stick to one of the least transparent platforms of its kind, which could be turned off, or turned into something else entirely, at the whim of a small group of people, with no recourse or accountability.
I've been listening to users lamenting "the tech to avoid centralized control doesn't exist" etc. for 20 years, but it definitely does exist today, and it is now clear that the vast majority of people (including tech people) just don't give a fuck.