The feature isn’t something brand-new, built from the ground up. Instead, it’s a direct integration with TuneMyMusic, which lets you shuttle playlists between services like Tidal, YouTube Music, Qobuz, Beatport, and even Napster. Of course, TuneMyMusic is just one of several services that offer the same ability, including Soundiiz and SongShift, which powers Apple Music’s import feature.
While you could go straight to these third parties to move playlists between services, often, there are limits on how many playlists and how long they can be at the free tier. Going directly through Spotify and Apple gets you the full premium, unlimited transfer experience, albeit in one direction only. The ability to tranfer your playlists from directly within the Spotify mobile app is rolling out now globally.