Reddit's moderators are volunteers with iron fists who only police tiny sections of reddit. Admins get involved in TOS violations, not direct moderation.
What moderation? For what are you talking about? From what I gather they predominantly rely on automatic filtering, with barely any human filtering. They don't even moderate some of their largest channels.
Reddit does the same broad stroke in that yea they have broad generic spam/bot detection, and also rely on reporting moderation and community driven tool. They already operate in a similar/better model than youtube.
The original argument was that Reddit/HN couldn't handle 5% of Youtube community and I am calling nonsense to that.
Nobody subscribes to all of Reddit.