I didn't think about it much. Given your fairly good points, my answer would be just this sub, or if there are any other kinda deliberately off-topic and which people who think they are 'clever' can try to promote a particular brand of propaganda.
Maybe on some of the 'announce subs it also makes sense for there to be no self-moderation since the announce thread often becomes a rather valuable source of community feedback on the real-world operation of a particular effort. It would suck for a scammer to get away with scams longer because he moderated out complaints. But then anyone could start and [service ann]-UNMOD thread for the general community to discuss a service I suppose. Maybe it happens. I kinda almost exclusively scan/troll the politics+society one these days for general non-BTC related entertainment since I don't indulge in any other form of social media