[grzm]

> "People put a lot of energy into programming languages, but they don't expect to get paid anything for it. Why is it different when it comes to publishing a book?"

The difference is what the people who choose to do the work expect to get out of it. There are people who work on programming languages (or software) that have commercial licenses. That's their choice. Choosing to ignore their choice, to subvert the terms on which they choose to offer the fruits of their labor, is wrong.

If you can convince them to offer their work under other terms, great. Until then, respect the terms the authors (of books, languages, and software) have chosen.