After studying the many of their ratings I find them to be ironically bias themselves. Over and over again they seem to ignore anything negative regarding left leaning sources. (Hopefully not disingenuously). Here is an example of their bias: https://www.justfactsdaily.com/media-bias-fact-check-incompetent-or-dishonest
Tip for consumers: My tip is to only use their ratings as a guide.......not as gospel. Much more prudent to fact check each article on your own as much as possible instead either believing or not believing what is reported based on a source rating by any company.