It’s also entirely useless for marketing or for selling anything, because it is infested with the kind of content that infests a place when there are no content restrictions, and will likely damage a brand more than it helps.
Also I’m pretty sure everyone there sees everyone else there the way you’d see vermin, as the literal dregs of society. Hard to astroturf when nobody reading has a thimble’s worth of respect for you or what you say. Very self-aware kind of humor. I don’t know how well astroturfing would work in 4chan for the major subset of the audience(The ones with a minimum of common sense).