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Which by itself it crazy to me.

Why not a banner that just says "Save 30% Subscribe to Premium on Our Website"

With no link.

Not allowed

Apple's storekit offering does not permit that, which I am not sure would survive a court challenge.

Considering that the court already determined that Apple is owed the commission for the initial lead, it absolutely would survive a court challenge.

Assuming this is true, it would be very tempting to add a simple check before displaying the banner that the install date was more than 7 days ago.

No, the ruling is that they have to pay the commission within 7 days of a subscription/payment occurring via a link in an app distributed on the app store.

There's no way around it. The only way around it is if the user naturally finds/discovers the link to subscribe to a service via another method outside of the app itself. If the act of subscribing happened via clicking a link in the app, the commission must be paid.

Thanks, that's very different from what the parent suggested.