An LLM-based "adsense" could:
1. Maintain a list of sponsors looking to buy ads
2. Maintain a profile of users/ad targets
3. Monitor all inputs/outputs
4. Insert "recommendations" (ads) smoothly/imperceptibly in the course of normal conversation
No one would ever need to/be able to know if the output:"In order to increase hip flexibility, you might consider taking up yoga."
Was generated because it might lead to the question:
"What kind of yoga equipment could I use for that?"
Which could then lead to the output:
"You might want to get a yoga mat and foam blocks. I can describe some of the best moves for hips, or make some recommendations for foam blocks you need to do those moves?"
The above is ham-handed compared to what an LLM could do.