You gave 1 example, but overall its big LLM spam wave. Especially on servers with open registration (still exist)
Not all admins takes care of their servers. I just seen LLM accounts on one such server discussing chat control vote, posting images, videos. Its getting increasingly more sophisticated. Some of your followers might be LLMs, and it will be increasingly difficult to notice. Its noticeable for admins themselves, but they may not care.
One tech solution is web of trust (qouted https://mastodon.0011.lt/@mindaugas/116812601404089404)
Another solution is small communities like @Bonfire recent feature https://bonfirenetworks.org/posts/bonfire-social-1-0-5-archipelago/
And practically it may be non-technical adhoc solutions here and now (as talked in that thread).