And users are entitled to better app stores. In other words, users are entitled to chose between businesses according to their abilities in utilizing their profits to deliver more value.

If there were competing app stores available on iOS, then we could say they are really entitled to that profit. But we don't know how much of this profit reflects the value they brought versus the rent they were able to get due to gatekeeping the only bridge into iOS-land. So no, we can't for sure say they are entitled to the entirety of that profit.

I think the overarching point that's emerging here is that those profits are a consequence of monopolistic rent-seeking...