You have plenty of non-profit newspapers. ProPublica. The Guardian. The Colorado Sun. The Salt Lake Tribune. Mother Jones. Le Devoir. La Presse. Mediapart

And how much of the market do these networks control? Just because there are non profits available doesn't negate their claim.

Also, if a journalist writes total bullshit, they lose their job. It's career suicide. Their articles follow them for their entire career. So they have to be careful.

Depending on what network they are submitting their work to.... It's not like "journalists" on Fox News are being shamed for submitting fake stories.