>Most people would agree that Spotify is a better music player while each of Google's music apps are bad in different ways
I am not so sure about that. Spotify is on top of its game : adjusting the loudness of tracks, using ogg, .. I am however pretty sure that to almost all the users, it makes no difference.
Furthermore, it is very hard to differentiate as a music service. Most of the features are present in all the services (albums, playlists, AI generated recommandations, radios, podcasts, etc) .
Regarding the price, it is up to Spotify to start creating its own content in order to make it go down. Right now the real issue IMO is that the majors are dictating an extremely high monthly price for the service.