Nothing is stopping Spotify from making their own phone and app marketplace. This is Apple’s platform, their App Store their rules. Don’t like it? Tough, create your own. Your example is trash because that’s government collusion to benefit in the market overall. Not the same thing.
Apple’s App Store is not a free market. Apple built it, runs it, maintains it, supports it, etc. They pay all the infrastructure fees. And when you say split it off, who do you propose pay for the App Store?
The App Store is like a shopping mall. Merchants lease space to be a part of the mall. If the mall developer has a store of their own, of course they would get a preferential deal on the lease payments of their own store because they own the mall. To say that couldn’t be done is ludicrous.
Logic is refreshing.