When you finance a car, the vehicle becomes collateral for a loan, but it belongs to you. A technology like this means that the vehicle still belongs to Ford, which means if something goes wrong with it, or if you get sciatica from their shitty seats, you can class action sue them into oblivion.
The reason we have laws is so that people have recourse to principle, whereas when you implement something like this in hardware (a car), it's dystopian vigilantism. I realize the largest future growth market for cars is in countries without reliable legal systems, and whose evolving governments will not hamper themselves the way the US did by guaranteeing individual freedoms, but this is why discourse about tech is important, as for every innovation, there's 100 scumbags like this inventor looking to leverage it to exploit people.