A very significant number of "fact checks" on sites like Politifact are in fact opinion articles masquerading as fact checks, with some links to sources added if we're lucky. Because a lot of people gave up on reading anything titled "opinion" since they already know what the opinion would be by just checking the name of the site. If you read lefty site, you know what they'd say on Trump or economy or immigration or whatever. Same on righty site. But people still may read something called "fact check" hoping to find anything other than propaganda. Until that well gets poisoned too.