I think this philosophical discussion is important, but just want to take a moment to point out that it often buries a pretty obvious lede and gives an out for aggressive bias.

For example, last night every major news site had a headline about Biden's electoral college victory, or about Biden's speech, or about the virus. Fox News's huge banner headline was that Joe Biden had "a bit of a cold". This to me indicates an extreme bias.

This is not to say other MSM sources aren't rife with bias--for example, all are staunchly pro-corporate, as they are owned by corporations. But bias does come in degrees; we must continually try to be aware of biases in our media, but we shouldn't treat all MSM as "equally biased and equally bad".