https://www.newscientist.com/article/2361657-ford-patents-car-that-can-repossess-itself-and-drive-back-to-showroom/
Someone is going to come up with some sort of tire lock that that, should the car try to drive itself back, will instead completely damage the body of the car.
Or, at least, I would.
Chain it to a tree or something. But odds are they will figure out a way to have you on the hook for life if there is any damage.