Yeah I know quite a few independent artists who not that long ago hated Spotify and refused to use it. Now they are releasing songs on it because they realise it's getting them publicity they weren't getting. But for a band that wants to release albums and tour based on albums I can't really see it being positive for too long. I also can't see labels playing too kindly and letting bands sign multiple contracts like happens in the book world where the same author can have a general publishing contract and a separate epub contract to release different books.
My cuz released a song on Spotify last night. Only a few years ago he was dead against any form of digital music and a social media hater. Now he's releasing wrestling entrance songs on Spotify and advertising via every one of his friends FB pages.