A free person shouldn't have to articulate why they need privacy.

Privacy should be the default in free societies.

I can play this game though: you are pregnant, but have not shared that information yet with your family because it's early term and there might be complications. The grocery store accurately predicts you are pregnant from your shopping habits (change in diet, per-natal vitamins, "New Mommy Magazine"). The grocery store snail mails you a New Mommy coupon book as a "thank you." Your family sees this and confronts you, forcing you to reveal your medical status against your wishes.

This is a scary outcome WHICH HAS ALREADY HAPPENED. https://bit.ly/3S3hlrA