The ones I and a friend visited contained very paranoid mods and tiered access to channels. Strict heirarchies seemed common and reminded me of cults like Scientology. A few put new users into an isolated channel and quizzed them on leftist ideology in an attempt to weed out wrong thinkers. Leftypol's discord channels were the worst with rampant paranoia and only a very small inner circle. Most consisted of tumblr-like people who complained about life, talked about popular entertainment, and posted lame memes. It felt like a stoner house in that sense. Discussion was weak and seemed bothersome to them. Below is a zipped archive of one of them before the user was banned for inactivity after three days.
mega.nz