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You Can't Look at Porn on Any Reddit Third-Party App Now
(www.vice.com)
This is a most excellent place for technology news and articles.
Yeah, they would have to include some limits so a user wasn't costing the app developer money. Not all existing users would have to sign up, though - people would just have to be required to sign up and pay to use the app in the future. It's certainly quite a disadvantage for 3rd party app users have to pay while the official app is free.