Anything exposed to the open internet devolves into porn or racism or both unless active effort is made to prevent it. I'm reminded of https://en.wikipedia.org/wiki/Tay_(bot)
Was the no-links policy there from the start? I think that would have helped a lot. As it is, you're allowed basically one outbound link from your profile, so there are link-expander services which people use to link to more things.