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> To remove the app - do we simply unpublish it from the stores? Will it automatically cancel subscriptions of existing users and refund them?
That should work and will cancel everyone's subscriptions but Apple and Google recommend a more gradual wind down, similar to what I described above. You can avoid more issues like many customers requesting refunds all at once by doing it gradually (it sounds like you have 12 months to wind it down which is great.)
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This is an existing answer which I have a follow up on. If you unpublish the app and existing subscriptions get cancelled, do users also receive a refund? Or are cancellations not the same as refunds? For iOS, can a user get a refund only when they proactively request it?