The only thing that makes iPhones more secure is the ability to lock them down, even then it would never be perfectly safe. Governments would stop at nothing to crack iPhones because of their ubiquity. Not saying android is miles better but the variety of hardware, and open nature is a solid foundation for fighting against universal exploits. Never assume a connected device is impenetrable

Should there be an expectation of privacy in public? Definitely wrong for footage to be able to wirelessly, without the owners consent, leave a car.