The fact there is some useful educational content is a byproduct of the machine of lucrative trash of the capitalist hellhole spiral, and the written word will always prevail comparatively. You can always bet on text. https://graydon2.dreamwidth.org/193447.html
Also, as you likely know, YouTube is owned by Google so it’s very silly to say it’s “more important.”
It doesn't make it net-bad. It makes it an ad-supported educational resource. Is that surprising, given that it's owned by an ad company?
“Net bad” means the world would be absolutely and inarguably better without YouTube. This is so outlandish, honestly; YouTube at its core is an information sharing platform and a lot of useful things have come out of it. Immense amounts even.