Re: What's the concern?
And there's no doubt there are people who have aggregated that data - including operators of web sites that promise to give you information such as address, phone number and more on anyone in the US. For a fee, of course.
And no one seems to be upset that these companies also aggregate police records, credit records, just about anything they can on everyone. Once upon a time, if you wanted a lot of info on someone, you really had to dig for it. Today, you just figuratively swipe a credit card and the info is there. I find that is intrusive as hell.
Having said that, I do wonder if this "researcher" merely accessed one or more of these companies' database.