If I can tell that the LLM didn't answer my question properly, why would I engage with the ad the answer contains, which would likely be equally irrelevant?

The google ad revenue and Meta ad revenue is hundreds of billions a year.

They have behavioural experts who know how mainstream minds work and how to manipulate.

Remembers ads are predominately not for the educated and intelligent, that type of person will think critically. People who are more naive are the golden gooses