A key insight. Many companies sell products that in turn have marketplaces which they wring some control over.
Game consoles is indeed an interesting one, because it parallels so perfectly. If Apple must allow competitor markets within iOS, so must Sony and Microsoft. (Note that physical game sales also require paying a commission to the console maker, so it's a different market but the same business model.)
Or cable TV. Does Comcast have a monopoly on selling additional cable channels and pay-per-view through my Comcast set top box? How is that any different?