That’s the interesting tech challenge. Keeping things anonymous, even if a db dump leaks, but still allowing moderation and users being able to block specific people. I’m still digging into the solution but believe I have a simple solution. The key is that not everything is anonymous, you know who you’re associated with. You just don’t know the association between a specific user and the content they authored.

A "show less of this" button should work even if you don't know who it is being applied to.