Who uses the phone book?

So like a lot of people, a phone book shows up in a plastic bag in my driveway.  Seems like it happens a couple of times each year.  For whatever reason this weekend I decided to open the bag.  Yes, it is smaller than I remembered.  It is also apparently very eco-friendly addition produced by Hibu .

Now, I am sure somebody keeps them and uses it a few times a year.  My household does not, fortunately today is garbage day so it is now in the recycle bin.  I did learn about www.yellowpagesoptout.com and have now opted out of the three available books.  Now what?