Anthem by Neal Stephenson. Minor spoilers below: There's a subplot about how the majority of the internet (aka the reticulum) is filled with AI generated crap.

Anthem by Neal Stephenson. Minor spoilers below: There's a subplot about how the majority of the internet (aka the reticulum) is filled with AI generated crap. Companies initially spammed the internet with blatant crap to sell their crap filtration services. Eventually the realized that spitting out gibberish was useless. The most valuable crap was something that was 99% true with just an ounce of bullshot/fake news. As crap generation got more and more advanced, it eventually outpaced the filters used to block and took on a life of its own.