I think it's not completely inconceivable that this could be regulated some day with music streaming. There are zero technical hurdles (unlike with complex apps like Google docs), and because there is such potential for decoupling the client the consumer benefits would likely be much greater.

I've been meaning to switch from Apple Music to Spotify for a while now (I'm on Android). I just had a look around the Spotify app today and the interface is terrible, it won't let me play and view my library like I want to. It would be so much easier if I could just use both from a single open source client, and then I wouldn't have to switch off to soundcloud and bandcamp for certain artists.

Wouldn't it be in the interests of players like Google and Apple to create this service/protocol, even before the regulatory net starts closing in?