To design any kind of service these days that doesn't presume the world to be full of spammers and trolls is to design a service for spammers and trolls. Yikes!
"While there’s no question that this growth includes a big amount of real people coming over from Reddit, unfortunately, there is also a huge amount of automated sign-ups by bots. … Up until yesterday, these bots were mostly just quietly sitting there, but as of today, the bots have started posting spam. … if we do defederate them, we are cutting off small instances who are clearly already struggling."
https://lemm.ee/post/197715