Nicely put; especially with respect to the business model. It almost seems that being competitive with traditional methods (bicycle, scooter, truck) almost will require more investment than can be expected as a return on capital. If human capital is very cheap in the markets for delivery (assumption) then establishing a break-even / profit point is genuinely of concern.

Also, I can't help but recall seeing pictures of some cities with smog so bad I wonder if drone pilots would even be able to see at certain altitudes. Limited scenario, I know, but seems to correspond with population density. Dense population seems kind of the ideal market, so, yeah, just a thought.