It's mostly the YOB that's valuable; 'basic demographics' is a powerful tool. Full DOB can probably isolate you from other people with same name for other mark

It's mostly the YOB that's valuable; 'basic demographics' is a powerful tool. Full DOB can probably isolate you from other people with same name for other marketing purposes. They do have 'adult v child' stuff so they for sure have legit reasons for wanting to know in addition to sleazy reasons.