Is Spotify a monopoly? They're competing with all the tech giants: Apple Music, Amazon Music, YouTube, not to mention good old fashioned piracy.
Yandex Music, too, which is surprisingly good
Spotify has been doing everything in its power to make sure it never becomes a monopoly; it regularly infuriates and sends users running for YouTube, Amazon Music, Apple Music, Google Music, Tidal, Sirius (dare I say; their successfully competing competitors)