But you don't have to store and serve all the content from Amazon or your own platform. You can easily set up aggressive caching, in a network you control, back

But you don't have to store and serve all the content from Amazon or your own platform. You can easily set up aggressive caching, in a network you control, backed by S3. And you pay premium for premium bandwidth. You can't just assume that all your users will have a good experience if you buy hardware and bandwidth from the cheapest providers around.