The functionality isn't fully baked yet
Spotify has offered deep integration with Facebook for years, including an option to log in with a Facebook account. The service added an Apple ID login option recently (to comply with new iOS policies), and now Spotify is rolling out an option to create an account through Google.
Spotify on Android now has a 'Continue with Google' option, which allows you to create a Spotify account connected to your Google account.
Read MoreSpotify now has an option to sign up with Google, but you shouldn't use it was written by the awesome team at Android Police.