Note to the people asking why this matters: Legally, if you take a position in federal court on X (i.e., that it's okay to ban external transactions by apps using your app store), and you are found to be doing not-X in an analogous situation (i.e., setting up external transactions to avoid fees in your competitors' app store), the court can rule against you in the original case...and then sanction you and your lawyer…
Obviously if Apple owns one platform, and Google owns the other platform, it is not actually the same situation. The law does not require that Google and Apple run their online stores the same way, or that Apple interact with Google's store the same way they choose to run their own store. In fact it's arguable that a free marketplace encourages and depends on different companies taking different approaches to meet cu…
That's actually what the court cases are for, and I'm not sure they've actually completed? It feels like you're asserting how you feel it should work out when it hasn't completed yet.