By "dx pirate radio stations" do mean the U.S. teeny boppers
"playing DJ" around 6955 USB on weekends, or HF radio stations
of underground political parties and/or revolutionaries in
third world countries?
This is where your Google search might have gotten crossed up.
A lot of serious SWL's follow the latter stations and
try to ID/QSL them. As to the former, well, the so-called "ops" make
rants about "free speech" and "free radio" but mostly what they do is
smoke dope and drink beer and play old records. (Using "opened up"
ham gear as transmitters.) They're idiots.
Imagine the HF SSB version of "Wayne's World".
And yes, the FCC does occasionally bust one, or they used to.
You can find more about them here: http://www.frn.net/
A waste of prefectly good radio time time listening
to them in my opinion, but whatever......
73, Ken AD6KA