Prince has reportedly requested that all streaming services except TIDAL, remove his catalog from their libraries. As of now, there’s been no explanation for the sudden change of heart beside's the text (seen below) on Prince's Spotify page.
TIDAL did exclusively stream his “Rally 4 Peace” concert which may have played a role, but who's to say. In addition to Spotify getting left out, Apple Music has also removed Prince’s catalog..for now. We'll keep you updated as more information becomes available.