Seems a waste but it is of a concern tbh,
Im just glad my factory ECU is still connected, no remap, and still thinks its running the engine, as i use it to run my clocks, and good luck to them finding the haltech ecu unit, they would have to take the dash out, and the wiring all looks factory,
also what about piggy back ecu units such as the Unichips etc, then dont alter the map on the ecu, they alter the signals going into the ecu to get the fuelling and ignition outputs needed, if wired in correctly and tucked away it would be almost impossible to tell they were there,
think they have a lot of thought to put into this before it becomes an effective means of keeping tabs on us,