There's also the fact that the 'left-wing' has constant infighting... about how to help people, whereas the 'right-wing' are (mostly) single issue voters who don't care what the other conservatives do so long as they get their thing. So a left-wing 'echo chamber' is kind of amusing when you try to imagine a Social Democrat and an Anarchist tacitly agreeing to almost anything.
Is there bias? Sure. What exactly that constitutes seems, to me at least, to be 'I don't think people should be in camps/have their rights removed/lose bodily autonomy, or that governments should spend more subsidizing oil and gas than all other areas.'