Many years ago,various luminaries spent a lot of time bewailing the lost opportunity to use Television for Education.
My answer to that was always: "If I want to be educated,I'll go to Night School!"
I can't use that one for the Internet,as "Night schools" teaching "hard" subjects are virtually extinct,because they cost money to run,which in a mean-spirited age,is not available.
In the past,kids who didn't take full advantage of the conventional Higher Education system for various reasons,could learn complex subjects after work,in a formal classroom situation.
Learning in a non-classroom situation,such as the Internet,or Correspondence is a lot harder,without the instant feedback of a classroom.