No, this is just business. Sony and Merlin have already sold all or parts of their shares, and are in the process of sharing the windfall with their labels. It's a pretty significant chunk of cash, so if Warner didn't do the same they would look incredibly bad.
Broader picture the majors want Spotify to succeed, because the alternative is having the business run by Apple and Google, who only have an ancillary interest in music.
Broader picture the majors want Spotify to succeed, because the alternative is having the business run by Apple and Google, who only have an ancillary interest in music.