More stupid from the trolls, and the judges who don't understand technology well enough to smack them down:
On March 17, a federal judge in the District of Columbia gave the USCG permission to demand from Internet Service Providers the name, current and permanent addresses, telephone numbers, e-mail, and device Media Access Control (MAC) addresses of those accused of copy infringement. Subpoenas are expected to go out this week, according to Wired.
I'd guess that a decent sized minority of those addresses were used by people leaching internet service off of someone else's wifi. It's not as if that's particularly hard to do.