While this sounds cool and futuristic, its a dumb idea for several reason...
1. How could it deliver to anyplace that isn't a wide open yard?
2. What happens when it crashes? Especially if it damages property or injures someone.
3. What happens when kids think its fun/funny to throw things at them?
4. How could it deliver to anyone beyond street level?
5. This would have severe weight restrictions and not be useful for a large % of items.
6. This would have issues delivering in a variety of weather/wind conditions.
7. Thieves would eventually target these for what they carry as well as the drones themselves.
8. Customers don't want their good delivered to the middle of their yard. They want them discretely placed by a door.
9. Urban areas are too dense for these and most rural areas are too far apart.
The real "drone" deliveries will be by USPS/UPS/FedEx via trucks once FSD is available. They will text people to alert they are coming soon. Once confirmed they will arrived and wait a time period for the recipient to collect the package from the truck using a code. Machinery in the truck will place the item in a locker where it can be retrieved from once the code is entered. Meanwhile, the truck is already texting the next recipient or 2 and prepping to deliver the next item. This can run 24/7 without the need for couriers or drivers. All it needs is someone to load the truck. If customers want something hand delivered, they can/will pay an upcharge. If they work 2nd shift and want their item delivered at 2AM, its no issue and no overtime pay will be required. This is the future. The biggest downside is the several million couriers/drivers whose jobs won't exist in 20 years.