Some BBSs let people from minority communities such as LGBTQ+ thrive in a place of peace from tormentors. A lot of them let people be themselves in a way they couldn’t be “in real life”. And yes, some harbored trolls and flamers. each BBS, or Usenet site, set their own policies.
These had to be harmonized to a certain extent with the global community, but with BBSs especially, you could use a different one if you didn’t like what the vibe was at a certain place. 5/