Those AIs are more like intentional cyberweapons turned into eldritch horrors (leftover from one of the apocalypses that have happened in the timeline) than just nonsense factories trying to get ad money. Elsewhere, however, there's a reference (I think on the radio) to an "AI author" that's supposed to be award winning and extremely prolific, including a blurb and summary to convey to the player that it's clearly just generating nonsense, so your point about how even their attempts to satirize what was clearly coming fail to be as shitty and absurd as the reality is dead on and something I've thought about myself too.

Another place they fall short is advertising: there's less of it and it's less intrusive than real advertising. Although that's honestly not surprising: the artists and writers they had could only devote so much time to making awful memetic spores, and had concerns like "style" and "humor" to think about, whereas real advertising has large dedicated teams working round the clock to churn out the most heinous and infectious memetic spores imaginable.