What I mean is, I have no idea who these people are. An established news organization relies on it's reputation. Losing that reputation costs them.
A brand new news organization has no reputation, and I have no idea who these people are. So I can't rely on it.
And when I say Mainstream I just mean the more well known ones that everyone knows already.
This is my point. I don't trust unknown sites on the internet. But if any of the sites you listed become known by everyone and establish a reputation they will then be considered mainstream. Which if we don't trust mainstream media, we need to seek out more unknown sites which also shouldn't trusted? Basically distrust of mainstream media winds up becoming "trust nobody ever" which doesn't get us anywhere.