An unmanned drone with whirling blades had better have some good apps on board to prevent hitting wires, or people.
It probably should be hijack-proof too, look how the Left likes to throw things at people.
I was thinking the same thing, but that could easily be solved. If they would have a kind of "subscription" service, with pre-registered, secure landing points (i.e. a private backyard, apartment complex quad, etc.) they could get the billing/credit card info for the customers prior to delivery in case the copter was nabbed. Then, if a subscriber was away from home, like at a public park, picnic area, drive in theater, etc. they could order and have their tacos delivered.
Between departure and delivery the copter would have to rely on speed and altitude to prevent being hijacked.
A no-no FAA regulatory-wise unless you are DHS and aim to snoop or shoot people.
The photo looks like an Arducopter, an autonomous quad rotor helicopter. The flight path is preprogrammed and it follows GPS waypoints. These will typically lift about a 1/2 to 1 pound payload and the range is limited by the battery, usually 10-20 minutes flying time.