This is why every time there was a post about "banning fake news" on HN, I specifically gave WashPost as an example (knowing they've written pure propaganda/false stories in the past) and questioned "whether a site like WashPost would have its fake news articles blocked on Facebook, too", when they are caught manufacturing stories (which they arguably did here).

Because if such articles from the big media companies wouldn't be blocked, then the system would be biased and unworkable, and Facebook or Google will just find a lot of backlash against them over it.