Marfeel doesn't mobilize forums because most advertising networks avoid them as they can’t guarantee brand-safe content. Marfeel's target is the optimization of content and maximizing ad revenue through that engaging design.
The real focus is on a publisher's traffic behavior and which portion of it is actually dedicated to article-reading. If a high percentage of users are utilizing a forum and a much smaller portion actually reads a publisher's articles, the website would be deemed as 'non-Marfeelizable.'
If the proportions are reversed and most users interact with the articles, a publisher's website is Marfeelizable.