Conversation

There's nothing in the 'who-to-follow' API that I can't replicate with a quick-and-dirty Python script that consumes public information.

There's nothing in the 'trending' hashtag API that I can't replicate with a quick-and-dirty Python script that consumes public toots.

There are technological limitations to how much safety you can have when speaking in public. If you really want a perfectly safe forum, you need to find or make a private, invite-only non-federated service.