The first footnote just turns me off: zero moderation means everything becomes 4Chan? How about the usual systems of vote ranking, reputation scores based on voting history to enable or disable posting power, etc? I think that a community can easily hit 90% of quality with just a few simple rules, a tiny number of human mods to handle a few egregious cases where someone obviously but cleverly circumvent said rules (like when people started spelling racial slurs through 1 letter tweet replies stacked), and a massive amount of crowd distributed power to reward what a critical mass wants.