I’m relatively sure they would bring the hammer down on the sender.

What hammer? It's legal, that's the problem.

Getting access to someone’s contact info legally doesn’t mean you can do whatever you want.

This would very easily be covered under harassment laws, which are a separate matter.

Doesn't mean you won't get hammered my friend.

To use a line sometimes attributed to Beria, “give me the man and I will give you the case against him”. By which I mean that I’m sure they will find some means of making you sorry.

They would make adjustments so that their details are protected, but the regular user is not.

Eh, California protects politicians from having their real estate holdings posted online by government, and afaik, most county recorders have decided it's easier to not let any of it be online than to figure out who is a politician and only restrict their information.

Of course, much of it is public information so businesses can go in person, get all the info and then list it.

Run for city council or the school board. Boom, now you're a "politician".