Running Amethyst Outbox in the middle of all of this spam is bizarre. Since it connects to whatever relay your follows use as public inbox if the public inbox relay has porn, it's the author's own fault. Each reply may or may not have porn is it all depends on the inbox relay of that reply.

Unfollowing the author is a great incentive to make authors choose good inbox relays for their followers. And probably pay for if they want to keep things really safe for their followers.