The TRS-80 Model 1 did the same. It had no on-board sound, so certain games came with the instruction to put an AM receiver near the computer & tune to a certain frequency. The interference from the game (e.g. a slot machine) coincided with the noise transmitting to the radio & so more-or-less provided crude (at least, synchronized) electronic sound effects.
The FCC told Tandy to fix it & that was one of the improvements with the Model 3 (which was built within a single enclosure). Presumably they could come down on the auto companies the same way.
