As soon as a popularity threshold gets reached you start getting lazy corporate memes (I think I saw coke vs mentos with ludicrously high number of upvotes in a programming subreddit recently), power hungry abusive mods and comments sections that look suspiciously like a marketing agency bought a reddit vote machine gun.

There are some exceptions which are run by some seriously underrated mods, but for some reason the exceptions seem to be protesting the loudest. If I were advance publications I'd be looking for somebody to fire.