He actively spreads misinformation, as most of his videos are based on a single source, and he never actually examines how legit the source is. His stuff always “makes sense” and sounds well thought out, but it actively makes its audience dumber, while think they are learning something.

His worst offender is his Americapox videos, in which he literally says Native Americans “are at the bottom of the (video game) tech tree.” because their native animals were too hard to domesticate. Treating development of cultures and technology as a linear video game style progression is bad enough, but the source for his pair of videos is “Guns Germs and Steel” a notorious pop-history book that has recieved a lot of negative criticism from historians for its inaccurate and infantilising depictions of native American civilisations, amongst other things, painting the conquest of the Americas as an “us or them” style thing, portraying it as “inevitable” and making absurd and insulting claims about native American groups, like the Inca being too stupid to know what an ambush was, because they didn’t have horses.

And when the innacuracies and downright racism of his source was called out, CGPGrey doubled down, instead of admitting fault, first he did the standard youtuber tantrum of “if you don’t like it, make your own video/I have more subscribers than you which means I’m right” sort of thing, and then when that didn’t work, he declared his videos were a “joke” and he was just trolling historians with them.

Dude claims to be an intellectual, but can’t ever admit the possibility that he is wrong or did poor research, in turn I think that means we can’t really trust anything he produces. It’s the “guy with a vaguely British accent says a thing with authority, so it must be intelligent and correct.” sort of content.