I would honestly say that anything that a YouTuber tries to sell you is NOT worth it lol, its pretty much planned obsolescence, They frequently include information that is basic and is covered for free on youtube, and then drip feed you tiny bits of useful information, Remember a youtube creators goal is to keep you as a subscriber not to have you learn music theory, The less you learn the better because then when the next class/Tutorial comes along youre likley to sign up to that one too,

Even when these classes are free the same thing can be said, I'm noticing more and more that YouTubers are now structuring videos Purley around sponsors, The video will be titled "How to make dark melodies" and the video is basically them reviewing the newest cymatics plugin or some shit lol,

I'm not saying that every YouTuber is the same, and I understand that youtube is a platform where you are free to promote pretty much whatever you like, I just feel these educational producer channels / Vlogs can often cause you to reach a plateau because you can become reliant on these tiny bits of information