Competing services can apply to be included in the program based on technical specifications (limit your bitrate, clearly identify the traffic as video).
Unfortunately, as a consumer, you don't have the technical resources to integrate your video provider with T-Mobile for them to support BingeOn. Your options are to wait, or move to another cellular provider (which doesn't, of course, have BingeOn).
That is why BingeOn is offered. T-Mobile receives a network efficiency benefit, which they pass along to their users as unlimited video. Just because the user complains they want something, doesn't mean they get it.