While that does show how unreliable mbfc can be, that isn’t quite the full picture. They do rate breitbart significantly lower in the credibility category compared to the guardian, as well as tagging them as propaganda, extreme right, and conspiracy theorists, which is an accurate takeaway for breitbart. Factual reporting is not all that mbfc covers
They can’t make your code proprietary, but they can still steal peoples data and make money all they like with your code, GPL has no privacy clause