This might shock you but cars where open source for years. Did you think those super detailed shop manuals anyone could buy where not intended to be used to work on the car? How about the massive aftermarket and any and all hot rods? This idea that you can’t fuck with you own stuff because its got a computer in it for “safety” is relatively new. Does no one else remember hooking a laptop up to the old ECUs and modifying how the engine works?