Quite the point of the thing, what?
They used to distribute these bulky books with people's names and phone numbers - sometimes even their physical addresses. Just printed in a book for all to see: and they gave the book to everybody who would take one. Millions of trees were pulped to make this possible.
The point of publishing information online is, well, to put information online. The fact that this fine article - and even this comment - is out there on the Interwebs all indexed and indelible isn't destroying the author's privacy at all. Putting stuff online is what these services are FOR.