And how would T-Mobile be compensated for that? AFAIK, the reason they're able to do this is because Netflix, Youtube, etc. pays them to be part of the program.
It's in T-Mobile's interest to do this for its own network management. The unlimited video is of much lower quality, using less bandwidth. The only agreement between T-Mobile and Netflix/YouTube is for T-Mobile to be allowed to control which quality is served over their network.
