Anyone can apply for T-Mobile's Music Freedom (zero-rated music streaming) and BingeOn (zero-rated video streaming) programs assuming you're providing legal content.
Edit: It's also worth noting that participation in the programs is free both for the provider and end user.
Your edit is the most important piece, and lets T-Mobile spin it as a network optimization program instead of paid prioritization, regardless of how it may actually work.
Edit: It's also worth noting that participation in the programs is free both for the provider and end user.