> The company making a device that is licensed by the FCC has to do everything that they can to mitigate the risk of an unlicensed broadcast on their devices.

Where do you see this in the rules? The only thing I see that even comes close is the following sentence:

"Manufacturers and importers should use good engineering judgment before they market and sell these products, to minimize possible interference"

Maybe it's because I don't routinely deal with the FCC but to me, that language doesn't imply anything close to your ironclad rule you posted.

I'll also point out there are plenty of other devices that get sold that seemingly break your rule. SDRs, walkie talkies with the power to transmit for miles, basically every computer motherboard made since the year 2010, the Flipper, etc. At most, they simply have some fine print in the manual saying "you should probably have an FCC license to use this".