Seriously though, the thing that Teespring really nailed for me is the experience. It's so unbelievably smooth, hats off to that team. Every inch of the product is very well thought out.
I just doubt that Amazon can do something as well when it's one of the million things they have on their plate.
For example , they are currently working on paying developers through in-game ads.Another source of payment could be t-shirt discounts, or t-shirt marketing services.
EDIT:and let's not forget - if t-shirt game marketing becomes popular , and most such t-shirts would be for games in amazon's appstore , that would create a powerful marketing tool for amazon's appstore.
"What bizarre project with small potential can we pour a bunch of time and money into today?"
So one creatively manipulates technology - you raise doubts about what weird technology will they be using( internet baloons ??? ) , while the other creatively manipulates business models - so you raise doubts about the business model .