Also note the remote disabling capability (even in owned cars) is similar to the laws requiring carriers remotely brick phones which have been reported stolen (to help thwart cell phone theft). Can the government really give a third party that power if the owner doesn't want it? There's some vague justification in cars, since they have to be operated on government-owned roads. But cell phones operate on spectrum which has been lawfully licensed so the government is not involved.
In México, at least, RF spectrum is government property. They are, as you say, licensed to the operator (be it a radiostation, a telco or whatever) but they are not their property. So I would think that it is more similar than a government-owned roads than not.
"It is easier to fight for principles than to live up to them." -- Alfred Adler