That being said, I can see being uncomfortable with them having access to your trunk.
It's unsettling to know with absolute precise certainty where a person is at all times of the day. It's even more unsettling to know that a retailer knows where their customers are at all times of the day.
This is Apple/Google's fault. It really wouldn't be hard to add a section to settings that very clearly defines which apps have which permissions, and make it easy to turn off permissions for specific apps. Google tried something like this, but backtracked quickly. Instead, they need to double down and kick out any apps that crash if they don't have permissions enabled for specific functions.
But when driving around on 5th avenue, seeing a DHL truck chasing you around? That's just not a reasonable expectation.
The reason these companies deliver to an address is because historically, that is the most convenient way for them to get your package to you.
Now it would be more convenient for you (and less so for them, given the amount of effort that goes into route planning) to deliver to wherever you are.
A truck would hardly 'chase you around', but might follow you until you've parked, and give the package to you then.
I'd say the service places an unreasonable expectation on the shipping company, rather than on the consumer.
Further down: "Using Audi's...communications system...DHL delivery drivers would track a customer's vehicle over a specified period of time and then use a digital access code to unlock the boot. This code would then expire as soon as the boot was shut."
...well this is all a little more unsettling than having your mailman or a FedEx driver drop by your house