I think you are the one who does not get it. Unless Beehaw completely defederate from everyone, posts on Beehaw is a part of the federation, meaning all federate communities that beehaw agrees to connect with.
This is why I said the whole defederate/federate thing Beehaw people do not seem to get or do not want to understand. You are part of this, we are not part of you. If you want your own community, commit to it and disconnect. If you want the benefit of the federation, you do have to work with other and deal with consequence.
I really doubt the number of people using uncensored chat bot is that high. The drop of usage probably has more to do with novelty and AI general limitation.
The AI models are not always that easy to use and they are being developed at neck breaking speed, so I cannot imagine the numbers of people dedicate themselves to use such AI would be that high.
There is a niche of using AI chatbot as RP tool for sure, but it has always been a separated thing from the start and it cannot cause such sudden drop.