That sounds good from an FAA public-relations standpoint, but in fact they haven't been "prosecuting" this at all. It goes on blatantly today, perpetrated by aircraft operators the FAA has known about for years. I can recall no major prosecutions or civil penalties levied against non-certificate holding private aircraft owners for flying pseudo-charters.
Apparently you missed Platinum Jet and that minor little ten million dollar TAG operational control debacle.