I don't know about Play Store policies, but Apple's App Store definitely doesn't allow the app listing or the app itself to link to an external site for subscri

I don't know about Play Store policies, but Apple's App Store definitely doesn't allow the app listing or the app itself to link to an external site for subscriptions or payment methods. See <https://gizmodo.com/5761383/apples-new-subscription-model-is-evil> https://gizmodo.com/5761383/apples-new-subscription-model-is... (I couldn't find a better reference after doing a quick search.)