I believe you are referencing the famous Target case. As I understand the dad was angry that Target was sending baby-related coupons to his teenage daughter.

I believe you are referencing the famous Target case. As I understand the dad was angry that Target was sending baby-related coupons to his teenage daughter. Finding out your teenage daughter is pregnant based on her shopping is easy. It’s actually harder not to notice. “Customers like you also bought” is an effective algorithm because people are mostly the same. Pregnancy has some very specific and unique needs which create a strong signal. Nobody is in a shady back room poring over chat logs and GPS coordinates looking for pregnant teenagers. It just falls out of the sysem.