This is a world first by the way folks. There will be a lot of countries looking to Australia and the ACT to see how it is done.
This was being trialed while I was living in Canberra. One of the main problems people had was the noise people also have concerns about privacy. Although it seems that delivery via drones has now moved beyond the trial phase and has been approved in the ACT.
Some interesting questions about how the proprietary nature of Googles software will effect competitors. Is regulation required?