Full Response from Apple 

What Spotify is demanding is something very different. After using the App Store for years to dramatically grow their business, Spotify seeks to keep all the benefits of the App Store ecosystem — including the substantial revenue that they draw from the App Store’s customers — without making any contributions to that marketplace. At the same time, they distribute the music you love while making ever-smaller contributions to the artists, musicians and songwriters who create it — even going so far as to take these creators to court.

I am not sure I'd quite agree with Spotify "using" the App Store to "dramatically" grow their business without making any contributions to the "marketplace". What they mean is using the App Store and not paying Apple for that privilege. Also the jab making "ever-smaller" contributions to the artist, is a separate issue all together and not the point of this particular argument. It's a valid argument, just not this one.

The only time we have requested adjustments is when Spotify has tried to sidestep the same rules that every other app follows.

Mmm. That every app follows. 🤔 What about Apple Music? Does it go through the same app approval process?

The only contribution that Apple requires is for digital goods and services that are purchased inside the app using our secure in-app purchase system

Oh, you left out the part where the purchase system is the only option. Against the rules to link out the any other option Against the rules to even mention having any other products of any kind that is not purchased directly through the in-app system. This is explicably user hostel on Apple's part. Why aren't talking about Google's Play Store because you can link to, mention, advertise other tiers and products in your app. That's the point, there are options. Look at Netflix if you download the app, and don't have an account, there is nothing for the user to do. They can't sign up, they don't have a clue what to do, or where to go. That is not a good user experience and wholly on Apple and their imposing rules.

I read this and I think, Apple is not budging on lowering the 30% fee. Not now, and with the focus on service revenue, not on an infinite time line. If anything, it will become more restrictive over time, not less.