I feel like this is a stunt. Drone delivery only works with customers that have private backyards - so won't work in a city, since the payload is unsecured after the drones drop it off. In a suburban/rural context, density is lower, meaning that with the limited range of drones, distribution centers won't be able to take advantage of density. Thus the range of products available at each distribution center will be much lower (it's much more efficient from an inventory/logistics standpoint to have one distribution center in midtown Manhattan with many products, rather than many distribution centers spread across the suburbs of NYC, say), forcing customers to choose from a given list of a few hundred products. Drone delivery is thus high convenience, ultra-high speed, low volume, high cost -- but more importantly, a low-choice process. What kind of things will you buy from a list that you need delivered within 30 minutes?