If a video hosting website wanted to join T-Mobile's "Binge On" program, they will agree to host their video in such a way that T-Mobile can detect which stream

If a video hosting website wanted to join T-Mobile's "Binge On" program, they will agree to host their video in such a way that T-Mobile can detect which stream to throttle. This could mean serving it from certain hosts, serving videos over HTTP, or some other out-of-band pen-and-paper agreement between T-Mobile and the video website. See here for technical details for video hosting services: http://www.t-mobile.com/content/dam/tmo/en-g/pdf/BingeOn-Video-Technical-Criteria-March-2016.pdf http://www.t-mobile.com/content/dam/tmo/en-g/pdf/BingeOn-Vid... Lots of video providers went out of their way to jump on board. It had the support of many industry players because "Binge On", at the time, was a net positive for customers. Now that the infrastructure is in place, T-Mobile can drop the nice marketing.