Amazon is successful because it brings nearly everything a consumer wants within two days' easy reach. They are able to do so because they have an excellent log

Amazon is successful because it brings nearly everything a consumer wants within two days' easy reach. They are able to do so because they have an excellent logistical ground game, maybe a peerless one. Without challenging them on this you are not truly competing with Amazon. This is more like competing with instacart or similar. That's a reasonable market, but operationally is a very hard nut to crack. I don't think having volunteers on bikes is going to manage it.