> Target got sooo good at identifying pregnant women

That's why I pay with cash and do not have a loyalty card (other customers often offer theirs at cash register anyway). And of course I don't even go to Target.

I don't know if Target specifically use all of these, but I would bet they have data based on at least some of facial/gait/demographic recognition, wi-fi/Bluetooth beaconing, vehicle registrations, time and location tracking, statistical analysis of your purchases and clustering of people you have made purchases next to (e.g. you bought something at same time and till as your mother more then once). I'm sure they have other methods too. They can also combine datasets from brokers that do have a face:name link (say you used a card at another store that captured it and sold the data) and resolve you within their own data that way.