The video stream itself is coming off a separate CDN, not their EC2 infrastructure, AFAIK. So that's probably not part of the comparable stuff. What's running on EC2 is the website, the authentication services for all the devices they support, the API for websites and all those devices they support, the recommendation engine, and perhaps a couple million people pinging them every few seconds with the status of their streams. I don't know how that works, but they must be talking to something since reloading a stream on any device will resume where you left off.