How does one define mainstream news?
It does not matter whether you're talking about the broadcast and cable television media (ABC, NBC, CBS, Fox), the new wave media of online-first reporting (All the properties of Conde Nast and Ziff Davis, incl. Wired, Vice, Cracked, Buzzfeed, etc.), or even the third-generation blogosphere (Substack, Medium). There's no trust because success is inversely correlated with trustworthiness.