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But if a fixed-line provider did that it would be considered a violation of network neutrality and the pitchforks come out.

How can a future challenger to Spotify compete in such am environment? etc

Well there's 45 services that already do, and it doesn't seem particularly hard to get on that list:

https://www.t-mobile.com/offer/music-freedom-list.html

Easy. Ask T-mobile to be included. It's free for the provider and from everything I know, relatively easy for a provider of legal video or audio content.

In Germany, It's the other way around - I'd love to continue using Google Play Music, but Spotify is included in the T-Mobile zero-rating, and GPM is not... :/

Pretty sure that’s not a thing anymore if you’re on their newer plans.

Really? Where do their policies spell this out?

https://support.t-mobile.com/docs/DOC-10969

Note that their new one plans are excluded because one plans are already "unlimited".

https://support.t-mobile.com/docs/DOC-24291

Also states this.