They did. Multiple times. HobbyKing went on the ol' "You have no jurisdiction" route, or tried to.
Additionally, the devices interefered with Aircraft and GPS Frequencies. If you jammed around in a less sensitive band (ie, blocked something non-vital), they might close an eye or two over it. But GPS and Airtraffic Frequencies is where any regulation agency on this planet will bring the hammer down because accidents caused by that would be quite costly in lives and money.
Additionally, the devices interefered with Aircraft and GPS Frequencies. If you jammed around in a less sensitive band (ie, blocked something non-vital), they might close an eye or two over it. But GPS and Airtraffic Frequencies is where any regulation agency on this planet will bring the hammer down because accidents caused by that would be quite costly in lives and money.