Supermarket tabloids can't go viral, so their impact and and lucrative adsense payout isn't there.

The president elect is a birther and anti-vaxxer. Bannon had a leadership role in Trumps campaign. His cabinet is a clown-car of conspiracy peddlers. Google and Facebook are taking action to squelch fake news. Fake news is a subject of interest to many influential individuals and organizations. If it weren't covered by mainstream news it would be irresponsible.