There’s such a dark cloud for automotive too, usually there’s a gateway between the diagnostic port/ bus and the vehicle network (usually CAN, LIN, Flex-ray) where you can still see traffic. They’re moving towards ethernet(100base-T2), although it’s easier to analyze the traffic the authentication is more complex and in many cases it requires “personalized login” which of course means paying a fee on top of your diagnostic tool subscription. In most cases re-programming used control modules is not permitted “for safety reasons”. Some brands sell a short time subscription but others (like Mercedes Benz) do so in the EU but not in USA/ CAN, there you need to buy a yearly subscription for around $4.5k plus taxes and fees and on top of their “approved tool” (another $2-4k).
