When you delete a Spotify playlist, it'll disappear from your Library, but it'll still be available to anyone who subscribed ...

To delete your Spotify account, you'll need to use the Spotify website in an internet browser. You can't delete your Spotify account from the mobile app. You also can't delete your Spotify account if ...

You can remove a song from a playlist on Spotify that you've created at any time on a computer or mobile device.