But yeah, the world has changed with the coming of the Internet and people are increasingly living in their own bubble. That doesn't mean we should shrug our shoulders and retreat further into that bubble, which is what you end up doing if you get your information from youtubers.
I agree with you that this is the age of the echo chamber, I just don't agree that it's completely limited to the internet. It greatly exacerbates the effect, but many facets of modern society are responsible here. I agree again that you should not just accept that, but I disagree that is what you're doing by seeking a second opinion on anything from one of the best sources of (largely, with many caveats) free information out there, which is Youtube. Basically anyone, from the village idiot to a literal PhD world-renowned expert on a topic, can make a Youtube channel and put information and opinions out there. If you can't see the value in that, I don't know what to tell you. Retreating further into the bubble of your favourite news network, whether that's MSNBC, CNN, Fox, Huff Po or the BBC is just as bad as watching literally only one Youtube channel.