You would get some niche subs were there was some decent discussion but once one passed about 100K subscribers there would be a noticeable downward spiral.
Uh no, if I'm looking up how to troubleshoot an issue with my computer's motherboard, I don't want to be told to slather it in banana pudding just because I like bananas. There ARE things where you can't "bias" your way out of it, things that are objectively correct and incorrect.
They're talking about people who believe misinformation or that their opinions and values are (or should be) universal. There is very little critical thinking or empathy from the masses on social media.