When people started calling my personal mobile number with questions about a voluntary organisation I'm involved with, I was confused: we weren't sharing that number. It turns out that Google had decided to take the number I used to verify my identity for Google Business some years prior and start putting it in Google Search results. WTF, Google?
With social media, e-mail, and the rest of it “out there” people have started assuming that “unlisted” is the default for voice phones now. Also, in those “good old days” of the ubiquitous phone books, the listings were mostly land-lines, and mobile phones were unlisted by default. Because of the rates charged for mobile calls in the dying days of the white pages, there were even special laws regarding unsolicited calls to your mobile phone.
It used to be difficult AND expensive to get an unlisted domain name as well, but that has been evolving and now it’s a no-cost checkbox option when registering whether you want your contact info to be listed with the domain ownership or not.
Times do change, and while we are generally more exposed than ever, I believe the shifts to more “private by default” configurations of our contact info are a good thing.