The other issue they hit on was that half of the companies that pay for their service never actually published anything. To negate this they decided to "make content for companies based on their data and then just charge them based on the performance."
While they are still charging for the content, I really like the concept of paying for performance (and not in some shady black-hat SEO way that gets your website banned from Google). No content marketing firms that I have ever worked with have even had this as an option...