All of the above is believable, except the last sentence
I can believe that, the except bit anyway.
In the olden days, if you had radio or TV interference, you would fill a form in at the Post Office, and it would be investigated by an interested and knowledgeable guy, and the problem probably resolved. For the past several years, your interference requires that you pay a fee to fill in the form, after which someone will spend enough time to justify the cost looking, finding being optional.
These RC sets are basically short range devices, there is no means of passively seeking them to analyse their signals - someone has to be on site deliberately looking. There is neither the willpower nor manpower to do that. A spot check MIGHT at some time happen somewhere in the importing process. Then again, it probably won't.