Well I think it's more than saying knowledge is powerful. Like yourself, I am subscribed to many of these channels, and I watch them on a regular basis. I watch them because we live in the age of information (and for my enjoyment); information can be easily accessed for free on the internet. This opportunity to learn ample information is such a valuable thing that I cannot help but binge these educational videos. Also, it makes traditional classrooms obsolete. I don't know if you're aware, but actual professors from renowned colleges (Berkeley, Irvine, Stanford, MIT, etc.) upload their lectures on the internet! Although, I am not in college yet, I will take these internet lectures over the actual lectures because I have the ability to re-watch, get cozy, and learn at my own speed by watching the lecture at home. I guess I'm a nerd.