I'm not trying to criticise your decision (I think it's up to you to choose the best path that's good for you), but moderation policies seem like the ideal thin

I'm not trying to criticise your decision (I think it's up to you to choose the best path that's good for you), but moderation policies seem like the ideal thing to have under an AGPL license. It would certainly allow users to know exactly what's going on rather than speculate (sometime vociferously and accusatively). Obviously the downside is that being able to look at the source may allow them to game the system (and maybe it's not great for spam detection). However, even that might be turned into an advantage in that if gaming the system forces them into better ways of communicating then it's fine. From a commercial perspective, I think you would be better off with the AGPL as well (perhaps dual licensing). I don't think you'd be able to sell such software on a per-license basis anyway (or, at least you'd not make much money at it as the audience is pretty limited). I think you'd be much better off positioning yourself as an expert in the area and selling contract services for other (perhaps proprietary) systems. Cheaper to hire you than to implement it themselves while tip-toeing around your implementation which they can't infringe.