Tesla's privacy policy does say that this data won't be shared outside of "Tesla personnel" [0] - what evidence do you have that Tesla would break their agreement with their customers, and which law(s) in which country(s) prohibit carriers from selling location data?
Most people don't carry portable Faraday cages.
One could argue that cellphones might secretly call home even on airplane mode and we shouldn't trust them, but then again, why couldn't one apply the same conspiracy theory against vehicles not made by Tesla?
It's harder to drive a car when it's wrapped in tinfoil.
