If growing your audience on social media isn't your thing, that's cool, but it's silly if not naive to assert that any social media network is ""supposed to be" about anything. It will be whatever the plurality of *active* participants in the network decide it will be.
Mastodon will never be whatever reactionaries say it's "supposed to be" about. That's simply not how social networks function. Never have, never will.
For specific examples, refer to IRC circa 1996 or Twitter circa Nov 5, 2022.