So the "obvious" isn't counter-intuitive, but it assumes some level of communication. What someone shares isn't "communication".
That's the inherent flaw in the premise and logic that follows.
The GPL's negative effect on freedom
Nope. The government stepping in and putting you in jail for lynching undesireables is a "negative effect on freedom" but is still a net gain in freedom. "Forcing" freedom is still more freedom than anarchy. In practice, anarchy quickly becomes a warlord system. So GPL, forcing those who use it to remain open isn't a negative effect on freedom.
Unless you think that putting a mass murderer in prison is a negative effect on freedom.
Except these sensors are outside the vehicle,
So are the backup sensors. The ones that don't fail in large numbers.
Genetics explains why you look like your father, and if you don't, why you should.