Tesla cars are not licensed for operation without a control of a driver. It's unlikely Tesla (the company) would take the financial responsibility to cause any damage or injury during an unlicensed operation without a driver.

Straight from the Model S manual:

"Model S may not detect certain obstacles, including those that are very narrow (e.g., bikes), lower than the fascia, or hanging from the ceiling. As such, Summon requires that you continually monitor your vehicle's movement and surroundings while it is in progress, and that you remain prepared to stop the vehicle at any time using the Tesla mobile app, by pressing any button on the key fob, or by pressing any Model S door handle."

https://www.tesla.com/sites/default/files/Model_S_release_no...