Yet another "Told you so" moment.
I was expecting this for Zip cars and the like, but most especially applies to anything "autonomous" which people keep harping on about. So I can summon a car to a field in the middle nowhere, put a dummy on the seat that "weighs" the right amount, and then instruct the car to drive to, say, the Houses of Parliament or just outside the Ecuadorian embassy, or whatever. All on the basis of a pinched or pre-pay credit card. Yeah, that doesn't at all like it could ever be misused. Hell, I could see genuine delivery companies misusing them to deliver their goods.
Wait for the same with drones... if they can be used to commit crime, they will. And not just "Oh, we flew it about the airport a bit" but actual, real, physical crime. What better way to ditch the proceeds of your heist while you're in the getaway car than to load it on a drone which is instructed to fly over the most awkward terrain possible to a secret location? Hell, kit it up with sensors so when people try to get near it, it flies off elsewhere and sits on top of inaccessible skyscraper roofs and the like to recharge. Jewellery heists. Drug-dealing. Prison-breaking. Getaway cars. If it can be abused, it will be abused.
Hell, even 10-year-old episodes of Police Interceptors talk about "pool cars" which are just nicked or cheap cars that are shared around the local estates for people to joy-ride, commit crime, etc. in and because so many people use them "who actually nicked it" is a question even they genuinely can't answer.
If a hire car can be used as a getaway car, drug-dealing car, a distraction, or just stolen-to-order, plates-changed and shipped abroad at profit, then for damn sure an automated service of the same is even worse, GPS tracking or not. Your GPS tracking means nothing once it's loaded into the back of a truck or shipping container, and then "looked at" by a guy who can just rip out any kill-switches or trackers he finds, en-route to South Africa or somewhere.
Hell, just as a mule-car... "Book a car from field X to street corner Y", load it with your drugs, send it off. Less traceable if you do it right than you turning up on some street corner. If you did it right, your buyers would literally never know who you were, especially "new" buyers given your details by your other customers. Burner phones? Pfft. Now we're given them burner cars.