Another particular headache as you get bigger is that humans are better for accuracy, but less consistent. No matter how specific you think your rules are, ther

Another particular headache as you get bigger is that humans are better for accuracy, but less consistent. No matter how specific you think your rules are, there will be edge cases where it isn't clear what side they're on. Different human moderators may rule differently on the same content, or even the same moderator at a different time of day. When users find these edge cases, inevitably somebody will get upset that you blocked X but not Y. And then you have to keep the actual abusive users from figuring out a way to leverage moderator X usually approving their just barely over the line images if they ever figure out how your approval requests are routed.