4chan's Rule 3: "You will not post any of the following outside of /b/: Troll posts, Racism, Anthropomorphic ("furry") pornography, Grotesque ("guro") images..."
These rules are constantly being violated across many of the boards, and moderators rarely take action on some of the boards when posts are reported unless they explicitly violate US law. I've seen so many threads get to 400+ replies and fall off the boards, threads that blatantly violate these rules. The period of time after the 2020 election was brutal, an enormous amount of violent and racist content was not removed.
Rules are often even selectively enforced, sculpting narratives that moderator cliques decide on (see /pol/ for example).
At some point, it's worthwhile to ask "who benefits?" from these rules not being enforced. The kind of content that doesn't get moderated is strictly far-right stuff.