I’m not familiar with MBFC. It may be similar but I don’t mind throwing some $$ at any project making these efforts. What I like about Ground News is that all the sources for a given story are aggregated to one page, sorted based on political bias, and rated on accuracy. That information combined with the “Blindspot” feature (which highlights when a story is disproportionately covered more by one side) is very powerful IMO. It looks like the blindspot feed it’s available to non-subscribers but doesn’t include the political bias of the source: https://ground.news/blindspot