Spotify no longer streams music in Apple’s Safari web browser

Mac Generation suspects that the decision might have something to do with the Widevine copy protection plugin. Spotify wants to use that for web-based music streaming, but macOS may flag it over concerns that its security isn’t sufficiently airtight. And without reliable access to Widevine, Spotify can’t guarantee that Safari will play properly even if it’s technically possible. – Job Fingas, Engadget