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Patreon will have to use Apple's in-app purchase system or be removed from the App Store
(www.engadget.com)
This is a most excellent place for technology news and articles.
For some reason, some developers get away with it... But that practice is specifically prohibited by Apple. Maybe the exception is for app developers that had a pre-existing deal before the rule went into effect or something, but directing users out of the app and into a web browser will get your app update denied. If Patreon were in a position to make that deal, they probably wouldn't be catching hell like this from Apple in the first place.