I think you have it wrong, there are different types of audiences. It’s not exactly hard to find a free source for learning any tech because there is just so mu

I think you have it wrong, there are different types of audiences. It’s not exactly hard to find a free source for learning any tech because there is just so much material out there, and in that environment it’s often better to get paid by people who have liked the work you offered them for free. I would have never read, or later purchased, the testing goat book for Django if it wasn’t freely available because I would have simply selected another source. People don’t really do that with fiction because there isn’t 9 million different Harry Potters that are all almost equally good. A further benefit of having a lot of people read your tech book is that you get more feedback which makes it easier to improve it, and a lot of tech books are really rather terrible until they’ve been heavily edited. And unlike fiction there is often a correct way to do things with tech.