Silly comparison -- linkbait headline. It doesn't even delve into Spotify economics, nor particularly the passive aspect of streaming income that starkly distinguishes it from busking.
Ok, we changed the title to an abridged version of the subtitle.
All income from content creation could be seen as passive, but there's an initial amount of work that is much more difficult with little chance of success.
Except busking (indeed any performance) carries an active component. There's opportunity cost with busking - not so with Spotify.