Millions of people around the world requests to watch that episode, then the network traffic to the server will concentrate, get denser and more congested, the closer you get to the server. This a classic hub-spoke-model. What Akamai does is to mirror and replicate the server, and its contents, closer to the viewers. This looks more like a hub-spoke-star-model, with fewer main spokes and secondary hub-spoke-structures at the end of the main spokes.