Unmanned machines are used not only as transportation but also as a platform for negotiations - in order to accelerate the pace of life and not to lose a second. They have enough comfort and safety due to multiple cameras, lidars and radars. An attacker can hack this unmanned machine and gain access to its various systems, including inside cameras - and steal the record of negotiations.
Alternative: ransom for your life during the ride. That is, you're going inside a car, and attackers tell you via the radio - pay now or you’ll bump into a pole.