Momentum of where friends and family are.
It's nice to be able to say "well they're not worth talking to then", but at some point I need to be able to reach my parents so they can babysit my daughter. Or be able to know that family will be in town and expecting me to be available. Or be able to have any way of knowing what life events are happening to my loved ones without having to wait for it to be brought up in casual conversation months later as if I should already know.
My extended family and friends do a poor job communicating on a good day. If I try to add another hurdle, I'm not the one who wins that fight.
How is that fucking legal?
Give us this very sensitive information, we promise we won't misuse it, and we'll let you fiddle our AI as a treat.