To be a professional is to have a duty to refuse to do stupid stuff like this, even if it's legal and even if your job depends on it. But is it legal? Why would we need any new laws for this? Connecting a wireless receiver to the same network that controls a car's brakes and steering seems to me like reckless endangerment. No need to wait for innocent people to die.
If history has shown us anything, it's that we cannot rely on software to separate two systems sharing a network. Only physics can do that. If we must have wireless for entertainment, then the entertainment and vehicle control networks must be air-gapped.
This seems blindingly obvious to me. What am I missing?