Literally explained in the second paragraph there.
You can't have private information which is meant to also be shared widely. It is the distinction between Access and Authorization.
You can't have private information which is meant to also be shared widely. It is the distinction between Access and Authorization.
Also, it's not just about "a desire not be interrupted by people you didn't agree to be interrupted by", it's about not having the data in the first place, for any reason, including tracking of any sorts.
Contact info being private is a relatively recent concept.