Aside from that it seems like a fundamentally expensive and risk laden application of technology. Is it going to be able to deliver at night, or in heavy rain / wind, or to urban buildings like apartments, or be able to detect wires, poles, trees that surround where most people live? Will pizza places have drone pads out front? Will staff be expected to charge / service these drones, and deal with whatever griefing / damage / vandalism they receive? Heaps of issues that it would be necessary to solve when the problem is already solved.