And open source is a social equalizer, it allows those who couldn't afford to license code a place to have access to and learn about coding, and development process.
Your argument basically sounds like we should close all public libraries because they rob the authors of books profits.
I would also argue that there are very few people that are being tricked into working on open source projects. Open source repos are worked on by people from all walks of life from people would went to the best colleges in the world, to people who didn't finish high school.
I love to know where you got these notitions from.
On an economic level, it ignores all of the benefits of open source materials, claims that more expensive goods result in greater wealth, and doesn’t account for comparative advantage.