[hatsunearu]

My experience is that 4chan is obscure and annoying enough to browse and participate that it keeps the lowest of low effort posts down. Like if you look at websites that are easy to participate, like Facebook or reddit, you're just gonna see the worst of the worst.

[tumsfestival]

Not sure that I agree. There's plenty of very, very annoying people completely derailing threads on every board by spamming shitposts and the like on 4chan. I'd say the anonymous nature is actually an incentive since there's no real consequences.