Try searching for a speciality business in the middle of nowhere (where there are zero providers).

I recently did this, and ended up in a warren of sites like "10 best Widget repair in Smallsville, MO", where all the addresses were for nonexistent businesses in other states, with sort of plausible names tangentially related to widgets. (High plains frobulator sales, Mesa, AZ, or whatever).

I'm pretty sure a deep learning algorithm produced that corner of the internet. It definitely contained lots of referral links and phone numbers. Never managed to reach a human or figure out what the scam was.