It's worth a lot of money for the ad-tech (consumer tracking) industry to understand. If a domain only occurs once in a user database, it's likely to be a pers

It's worth a lot of money for the ad-tech (consumer tracking) industry to understand. If a domain only occurs once in a user database, it's likely to be a personal domain. A data broker that sees the same domain in a few different datasets (once in each) can be quite confident that the domain is an individual's.