Speaking as someone who has been both a technical interviewer and an interviewee many times over the past 30 years, I find it a bit disingenuous to compare second hand bookstores to a formal primary or secondary education when it comes to their application in an active job market.

There's the Khan Academy, too. Apparently a lot of home schoolers rely on it, and it is used by students who need extra help.

It's true that what I wrote about is not formal education, but it is education nevertheless and freely available.