I think the /r/communism subs are so isolated (and they self-isolate and ban people all the time anyways) so it doesn't really matter from the Reddit bosses' perspective what they do.
I don't post on Reddit (and never will post on Reddit) but I've helped moderate a fairly large-ish forum, and some of the biggest headaches for mods is just keeping mentally-ill people from threatening politicians or each other for basic legal reasons, or trying to cut down on people talking in a bloodthirsty way because of the rare -- but frightening -- possibility that someone isn't kidding and will later go on to shoot up some place. That hasn't happened where I'm at but that's the absolute last thing I want to have happen. And also preventing different communities from fighting each other, because what happens is they take it too far and start doxxing their rival internet posters, or brigading from their sub into another, and then harassing the mods because the mods banned someone from their community for doing something stupid -- and then that causes them to go brigade and invade another sub again because "they're working with the mods against us." And you'll have both right wing and left wing factions doing the same thing and believing the mods are working for the other team, so then the crazy people start trying to doxx the mods and threaten them.
And this is stoked by nutso people who got banned years ago and still have a vendetta against the place and register accounts under different names to try and cause chaos. I didn't realize how crazy some people were about this internet stuff, but there are some really wacky people out there -- left and right or just extremist Dragonball Z fans who swears Goku is better than Vegeta or whatever -- and they'll hold onto grudges and develop vendettas against other posters and send them threatening messages. At first I was like wtf and the other mods were like "yeah that's probably so-and-so, we've banned them before" and then do an IP check to get rid of them so they don't send more lunatic sex propositions mixed with death threats to random people. It's just bizarre. The cop pic is kind of a joke because it's more like working the front desk of a hotel where 99% of the guests are cool but 1% are crazy people who trash their rooms and punch holes in the walls and cause 99% of the problems.
It's like this:
Like I said I don't post on Reddit but I remember seeing things on /r/chapotraphouse where they'd have the 🦞🦞🦞RIVAL SUB IS DEAD🦞🦞🦞 posts celebrating their Reddit enemies being banned. And then other subs would try to do the same to them. And Reddit is so big and unmanageable anyways that I can imagine the Reddit admins just got sick of the whole thing and banned all the irony subs just so they wouldn't have so many problems.
IMO... there's a deeper issue underway. There's a recession and the first thing to go when corporations cut back in a recession is advertising. And Reddit makes its money from advertising and sponsored showbiz subreddits for Marvel movies and Star Wars. Recessions can also -- for capital -- function as qualitative moments of resource reallocation after a long build-up of smaller, quantitative changes over time. In terms of digital advertising, corporations have for several years now been questioning whether advertising on Facebook for instance is worth it. They were still doing it because their competitors were doing it and they didn't want to lose the advantage, but then everyone has to cut back all at once because of the recession. And now they have an excuse to do it at the same time because of the BLM campaign against hate speech on Facebook, so the corporations "take a stand" and then reallocate the resources they already wanted to reallocate to begin with, and they're all doing it so they're not losing the competitive advantage vis-a-vis each other... it's like a wave breaking all at once. And Facebook apparently has already lost billions of dollars in ad revenue practically overnight.
So I can imagine Reddit wants to avoid that fate as well. And that means banning hate subs but unfortunately it also means your sick Lenin meme subreddit where you talk about chopping off the heads of landlords in a massive bloodbath (ironically) gets the axe too.