The world of today is so weird sometimes.

When I was a kid most adults' full name, phone number, and address were available for free in the phone book.

If the scam success rate is 0.1%, and it takes days to comb a phone book and put together a list of potential relationships and takes a human 10 minutes per phone call, the economics of scamming works out a lot less profitable than importing a data leak and emailing or robocalling everyone in the list.