You have many misunderstandings that you should probably have right first before continuing
CNN leans pretty far left, but not as left as MSNBC
NYT leans pretty far left, similarly to CNN
Reddit leans very far left, so does Facebook and Instagram
Media in general is very left leaning. For example, Youtube, Disney, Netflix are the biggest online video content house, and they all lean heavily left. Even Max leans slightly left. There is no right leaning online content house. And all contents are moving to online.
What you're calling "left" is center-right in the rest of the developed world. None of those are left leaning. They are all pro-corporate, pro-capitalist, anti-worker "infinite growth forever" media. Some of the journalists who work for them are left, but the owners are largely conservative and force them to cover Democratic scandals just as much as Republican ones, while Fox News and other conservative media outlets just outright ignore Republican scandals entirely.
If mainstream media in America was left, Bernie would have just finished up his second term.
CNN leans pretty far left, but not as left as MSNBC
NYT leans pretty far left, similarly to CNN
Reddit leans very far left, so does Facebook and Instagram
Media in general is very left leaning. For example, Youtube, Disney, Netflix are the biggest online video content house, and they all lean heavily left. Even Max leans slightly left. There is no right leaning online content house. And all contents are moving to online.