Tyranny only occurs when you can’t exit. All cyber communities are opt-in, opt-out.
No one owns a “topic” but, yes, people organize themselves into groups and submit to rules and enforcement by leaders every single day
They do this because it brings benefits that you seem totally unaware of, despite all the evidence
Most people don’t want to scream into an open, unbounded void, and until someone defines boundaries they don’t see the appeal, this is why Nostr is not seeing adoption