If you were correct, NOBODY would offer comprehensive curriculum-based Photoshop classes at colleges or online, because EVERYBODY would learn it for FREE, as you say. But they don't. Because you're incorrect.
So then, you can believe it or not, concur or not, but you're simply wrong on this.
If you'd taken actual comprehensive curriculum-based Photoshop courses, either online or at a college, you'd understand this. Your opinion without that actual experience is from a position of ignorance (and I don't mean that in a derogatory way - only that you just don't know any better, which is the definition of ignorance - I'm ignorant on lots of things, like how to break dance). Without that actual experience with a set of actual comprehensive curriculum-based Photoshop courses, it's impossible for you to make a valid comparison between them and the "free" million-link Google-search/Youtube shotgun training you advocate.
I've done both, so I have the actual experience to make such comparisons, which is exactly how I KNOW that it's WELL WORTH the $25.