Does Spotify control one of the two major music platforms and use that control to require artists to use only their music service (via exclusives)?

And can you explain how I am using Spotify on my iPhone if Apple is "forcing" users to only use Apple Music ?

> Does Spotify control one of the two major music platforms and use that control to require artists to use only their music service (via exclusives)?

Exclusives aren't mandatory. The artists get paid extra for that and can decline it if they want to.

> And can you explain how I am using Spotify on my iPhone if Apple is "forcing" users to only use Apple Music ?

The analogy to "their music service" is Apple requiring iPhone users to use exclusively their iOS app store.