It comes down to DRM and BS in the software industry. Anything with a EULA usually disallows you from doing anything "unauthorized" with it, and Teslas have a lot of software and EULA
I will agree that software authoritarianism is a big source of ambiguous fear being pushed onto other endeavors, but a contractual dispute is a far cry from "illegal". And yes the broken-ass DMCA can lift some of that into the realm of illegal, but even that is practically unenforceable beyond a mere chilling effect on publishing.