You think I'm arguing in bad faith? That I'm deliberately advancing an argument I know to be untrue? OK, interesting...
Anyway, moving on, I think you make some good points. Absoultely, so-called MSM has gaslighted people on various occasions. But that doesn't disprove the "duped by information campaigns" premise, it supports it. People are distrustful of MSM because they have been successfully deceived in the past. Millions were duped into thinking that the Iraq War was honestly precipitated by weapons of mass distruction not only because they were lied to by the government but because it was aided by passionate support in MSM, notoriously the New York Times.
And I'm not sold on the idea that communities are diligent in spotting their own misinformation. Look how homeopathy and astrology persist, generations after they have been shown to be bunk. In the case of homeopathy, people often seek it out because they feel duped and misled by Big Pharama. And that's a mistake that people make. They are rightfully skeptical of a mainstream idea but then latch on to an even more dubious idea because it seems like arcane truth, the fruit of their own research against the Brzezinski-esque medical establishment telling them what's for their own good. And then, because of the sunk cost fallacy, they hold onto the bad idea far longer than they should, even propagating it like a religion.
"One only need look at all the conspiracy theories that have turned out to be 100% true these past 2 years." What did you have in mind? I can only think of maybe one (non mainstream I presume) conspiracy theory that turned out to be 100% true. Most of the time, and this is key, just because the mainstream theory had flaws doesn't mean any of its concomitant conspiracy theories were 100% correct. In general they aren't, because like cancer cells they lack a control mechanism to keep them from continuously mutating. Plausible election irregularities turn into pallets of ballots, which turn into the ghost of Hugo Chavez owning voting machines, etc.
One of the problems with deciding to eschew mainstream sources of information, is that you often have no way of determining truth value through your own personal experience or expertise. I'm not a physician, epidemiologist or virologist. In order to conclude anything, I have to have faith that data provided by other people is accurate. In the past, unreliable sources of information were naturally lost over time because they got no support. But with SEO, spam, and/or astroturfing, any bit of misinformation can be propagated as broadly as the truth. And people are expected to wade through that and stumble upon the facts? Maybe, but have you heard of Borges' Library of Babel[0]? It's a story describing an infinite library where volumes are printed with random text, so every possible permutation of letters is there. Everything that is true is there, but so is every lie, and every near truth. But because all information is equally available without regard for truth, the library is effectively useless. That's what an entirely uncurated internet becomes.
[0] https://en.m.wikipedia.org/wiki/The_Library_of_Babel