[toomuchtodo]

T-Mobile zero rates in the US as a technical measure, and all content that adheres to their technical requirements is eligible for zero rating (even adult content).

[will_hughes]

Are you talking about the Binge-On service[1]? That's an optional service on both the customer and provider side.

Either way, there's no additional charges on the customer or provider side.

[1] https://www.t-mobile.com/offer/binge-on-streaming-video.html