There’s a lot to the features that Spotify provides. First, there’s the social side: collaborative playlists, “jam sessions” that let your friends add songs to the queue, Spotify wrapped, etc.; then there’s the functionality side: I can play a song on my laptop and pick up right where I left off on my phone, or even switch to my phone while it’s still playing, the recommendations are great and, increasingly, people are turning to Spotify-curated playlists rather than making their own or selecting songs individually. All of those are things you can’t replicate easily outside of Spotify, with the exception of recommendations