4Chan is one of the few online communites with the 'spirit' of the old internet, it has remained functionally the same since 2003. There's only a few sites like that left (newgrounds? Somethingawful?).
Somethingawful threw some of their worst shitposters out, and they went to 4Chan. 4Chan has since thrown a subset of their worst shitposters out, and they went to... Other forums.