@osma
There is a joke in my country:
Teacher: What did you just say?!! There is no such word!!!
Pupil: Well, strange, there is an asshole, but there is no such word...
If you have people, who are racist (misogynistic, fundamentalist etc.), they will find a way to communicate unless you completely strip the privacy from everyone.
Speaking cynically - it's better for the mainstream understanding of "good" to have one cesspool where it's easy to lure unstable minds than to hunt for them through dozens of E2E encrypted invite-only chats.