This in itself isn't the issue. The issue is one of architecture and separation of responsibilities. Say you're Reddit, and allow people to have "sub-reddits" a

This in itself isn't the issue. The issue is one of architecture and separation of responsibilities. Say you're Reddit, and allow people to have "sub-reddits" and they have their own moderators, and you rarely get involved in moderation yourself, except in extreme circumstances. Reddit is still the only means of accessing Reddit, but moderation is not baked as hard into its architecture (now, Reddit itself is not an ideal example of this in practice, but I hope good enough as structural example).