I'm old enough to have lived with a phone number published and not have to worry about it. Then came the telemarketers. Still, long distance calls were expensive and such calls were relatively rare. Next, long distance calling became effectively free and telemarketing calls were becoming frequent. However, it was still only a dumb phone - so nothing to worry about. Then, smart phones came along, storing personal information and being potentially vulnerable to threats. They were also used for authentication. But hey, not to worry, since it's just like before: everybody used to be in the phone book ...