Well, conspiracy theories? That’s a pretty broad brush right there. Saying the virus originated in the Wuhan lab, or that it was even bioengineered at all was a “conspiracy theory” that got a lot of people banned from all kinds of forums.
Saying that conspiracy theories means artificial birds and flat earth is simply saying that any ideas that you think can be labeled as “conspiracy theories” are just as stupid. But that is not the case.
Even saying that the US provoked the war in Ukraine is probably so thing bannable according to your logic.