Going Forward Don't Use the Apple App to Subscribe to ANYONE (Patreon)
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This Does Not Effect any current subscriptions! However,
Starting in November, Patreon is being forced to apply Apple's 30% App Store fee. This means that if you use the Patreon App from the Apple Store, you will be subject to this fee. All you need to do to get around this is subscribe to a Patreon through a web browser instead. After that, as long as you don't mess with your membership, you can use the Patreon App again. Here is Patreon's announcement and FAQ:
https://news.patreon.com/articles/understanding-apple-requirements-for-patreon
https://support.patreon.com/hc/en-us/articles/27992151772813-iOS-in-app-purchases-FAQ