The Apple-Spotify relationship could face new pressure after Spotify began distributing emails recommending that users avoid buying subscriptions to the streaming service through Apple’s app store. The subscriptions run $13 through Apple, compared to $10 on Spotify’s website. Apple charges a 30 percent cut in a model that many companies rely upon to get their products to consumers. “The emails explained how to cancel the app store subscriptions and sign up on the Spotify website,” reports Bloomberg. “Apple doesn’t encourage this kind of thing. The company forbids any buttons or links within apps that could allow people to buy things externally that they would otherwise purchase through the app.”