I doubt that even 1% of internet users understand the extent of the PII that is collected. I would guess if the general public understood how all this worked, there would be many more people who objected to the practice.

Many of them probably also didn't set the ad blocker up themselves - they have tech-savvy relatives handle their computer stuff, and those tech-savvy relatives have realized that fewer ads means fewer malicious social engineering ads means less malware to remove during the next visit.