Offer a button to turn off the car from the app. It may make stealing of the car less likely.
When the car moves without the owner’s cellphone closely the car sends an SMS and the owner can shut it down remotely. If the car is moving faster than a certain speed a countdown could be started.
Moderator: There are some legal/safety concerns that may prevent this option. It may also create some legal liability for Tesla if the event causes an accident or kills someone.
If someone hacked your account or even a partner you gave access to your account, they could stop you on the freeway and cause a major accident. Of course, if the thief steals your phone at the same time, this option becomes moot.
(voting combined from a close duplicate that has been removed)