The neat thing is that Reddit is community moderated. Each community is allowed to set their own standards, but they also need to clean up their own spam. So, /r/science doesn't allow any jokes at all while /r/Antiwork bans anything that's pro-corporation.

But several times, mostly when the controversy got too hot, the admins have killed subreddits, like /r/The_Donald, /r/incels, and /r/FatPeopleHate.