I don't know what kind of googling you guys did before but it's been pretty easy in the past to simply google an address or phone number or name+town combo and get the results of their name, their address, where they work, where they've lived before, the other people who lived at that address... Nowadays you see a paywall for much of it but sometimes it's all exposed.

How do you think people have been doxxing people for so long anyway?