Youtube for Magazines

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offers offline reading, search and discovery tools for finding newspapers, catalogs and magazines, and a personalization algorithm that suggests new content based on your previous reading. Additionally, users can read through their own favorite magazines (“stacks” in issuu), or dive into the content by focusing on their interests.
Proud of the @issuu team on the great iOS app.
We've used them as a publisher and one of our licensees still does a magazine with them. The problem we had was we can't charge for subscriptions. Otherwise we'd still be using them. (But did enjoy the service, so no complaints there.)
What is the business model behind Issuu? How do they make their money? With Zinio, I have to pay for every magazine.