I'm into niche VTubers and other anime stuff. Twitter is pretty much the primary platform for keeping up with Vtubers (besides wherever they stream).

The other platforms don't let you interact with or keep up with the vtubers directly, and often involve just mindlessly repeating the same joke, or they go the opposite route and take things so seriously that all discussion is stifled.

With other anime stuff, Twitter is the easiest way to keep up with the Japanese side of things.

Lately I've learned about tildes and while I haven't looked around much, it has me wondering if maybe invite-only forums with low barriers to entry (and low barriers to being banned) are the way to go.