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The article points out that changes in the subscription price will prompt a user to accept. If they take no action the subscription is cancelled automatically. So as a developer, changing your price could have a big attrition rate for current subscribers.

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Yes, but if your customers have a lot of valuable data in your service, cancelling would make them loose that data. You can technically use this to extort money from your users. Not a viable business plan in the long run, for sure, but there are plenty of businesses that would try, I think.

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