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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.
There are a lot of people out there that will not use a website and only use an app for things. I'm willing to bet there's some users of patreon on ios that don't even know there is a website.
Notifications of new content are nice.
There's this ancient standard called email
There's also web push. You can send push notifications straight to someone's browser, no need for a dedicated app anymore. Not sure if patreon has implemented this, but they could if they wanted to.