Rethink subscription model
I only needed to sync my iCloud reminders with Android for a while after I lost my phone and had to use Android temporarily. Any.do doesn't sync with my Mac's Reminders app. You should work on that.
Not only that, Apple doesn't charge for syncing Notes, Reminders and Calendar which is basically what Any.do does. Neither does Google. Why on earth would I pay for services that run natively on a given platform?--on a third party that won't sync in the background if the app is not asleep somewhere.
I'd gladly pay upfront for your app, after all you put work on it, but not in a recurring fashion, ever.
Any.do has released a sync between tasks and Apple Reminders so that your reminders are shown in your app :)