K-12: https://www.khanacademy.org/
All free, available on the supercomputer in your pocket.
If everyone watched a 2007 youtube course on circuits at MIT and learned the material, the value of such a skillset would be equal to the value of flipping Burgers at Burger King.
Ironically, my grandfather at the time made his career by selling correspondence courses for college degrees. It was the equivalent in those days. He met my grandmother selling her a course in mechanical engineering she used to get a better job at the phone company.
My grandfather started literally at the bottom - shoveling coal into a steamship's boiler. A dirty, dangerous, sweaty job he did for years. He improved his lot by taking correspondence courses, and liked them so much decided on a career in selling them, primarily to sailors.
> If everyone
I wouldn't conflate "don't" with "can't".
I know about the MIT course because I took it myself (along with others) to fill in gaps in my education. And why not? Education doesn't stop with the diploma.
Not to mention entirely dependent on the unsupported precept that traditional teaching structures were apparently worthless - but, it's cheap to put your money where your mouth is on this: are you going to save a lot of time and money and educate your children solely via these resources?
Yet I wangled a job writing software despite a mechanical engineering job achieved without CS courses. I also know several people at Microsoft in programming jobs who had no college experience. There are tens of thousands of employers, all different. You can even start your own business doing programming, EE design, whatever.
> apparently worthless
Not at all. It's maybe a harder road, sure, but it's navigable for those who want to do it for free.
Source? even the most conservative people I know who went to school in the 80s/90s say they could never afford it now. I myself am trying to figure out how to pay for it without $40k grand in debt if I choose to go back.