I've seen a lot of shady moderation on reddit and it's one reason I quit using it. There is the obvious brigading, mods on powertrips and but also massive probably paid astro turfing campaigns. Reddit has gone downhill substantially in the last five years. HN is not immune either, but at least we dont' have a 'mods on powertrips' problem, in fact the opposite.
I've also just been using reddit for far too long. It's gotten to the point where I sometimes feel like I've seen all of the internet, because I recognize way too many videos/posts/stories/cool facts/etc as ones I have seen before.
Agreed, "mods" binging on their little power is a problem everywhere in society, and in Reddit it's made even worse by the fact they are hiding behind their screen