All true, but I'm told there is a time-date "enforcement" protocol built into each IBOC exciter (irrespective of manufacturer.) And that IS policed by iBiquity. The Decepticons have set-up modes allowing you to install the exciter/importer/exciter and test it for a finite (brief) period. Then to get it to work ongoing, a code has to be entered. If your payment isn't made, you don't get a code to unlock the device. At the end of the license period the code runs out and cancels operation.
Incidentally, our automation software has the same "timeout" feature, and it runs on any computer you use, whether you get it locally or from the same vendor. Once they get your check they download unlock codes directly to the machine over the web.
I doubt iBiquity has any interest in pursuing its customers legally to enforce contracts when this simple, zero-cost expedient is available. What's The Stroob gonna do with a fistful of deadbeat station "judgments suitable for framing??"