I don't know, how much economic factors play into this compared to the demographics of journalists. Like, in Germany we have two big public news stations wich are financed by an 18€ fee every (working) citizen has to pay, wether they watch/listen to it or not, so there is no need to be profitable. Yet those stations have a clear progressive bias.

So a reason for this might be, that - especially young - journalists often come from an urban, academic class, some sociologist called them "progressive left", but they are more like "woke capitalists" with values and a worldview that is highly different from the rest of the people, so many people don't feel represented by them but rather often patronised.