That link at the bottom of the email states that they unsubscribe you from the mailing list.

Odd how I always seem to get more spam, but from different companies, after I click one. Almost as though all I've done is confirm that the email address actually exists, and is therefore more valuable to sell on to others.

Perhaps the policy is new. This was about a decade ago.

Regardless, that data is out there now, and no change in privacy policy is going to put that cat back into the bag. Besides, someone else is surely acting as a new source for current data.

It wasn't just my location information, though. They were able to ask detailed questions about my personal social network, before Facebook was ubiquitous and LinkedIn was a thing. They were clearly joining several disparate datasets together to discovery relationships.