Yes, it is public information, but not everyone knows how to find it.
Believe it or not, there are people on the internet who would like to do
other people harm, or even steal everything they own. If Bobby-boy really
got somebody ****ed enough to do him harm, well now they know where to find
him. If some crook is looking for some rich yacht owner to steal from, he
now knows where Bobsprit lives, and the boobarino hasn't been shy about
boasting about his possessions.

Telephone books are filled with names and addresses. The vast majority are
just that and nothing else to any given individual. They don't advertise
who somebody is or what they have.