I did not use Twitter. I do not use X. I'm even less inclined to become a user after the Musk takeover. I don't even know anyone who is active on X. However, I still constantly get linked to tweets and see screenshots of tweets (or whatever they're called now). And I never see anything from competing platforms.

X may be failing by many metrics, but in terms of popularity it is still the undisputed king of its market. It's by no means "niche".