Open source is a two edge sword. If developers voluntarily contribute to the projects, it could be positive.

But increasingly it's becoming a source of cheap labor. It used to be that you get a college degree and start a job. Now you need years of schooling, unpaid internships, postdoc and unpaid scientific contributions, an extensive GitHub page with open source contributions, etc to get the same job. The competition for better CVs will push individuals towards taking years of unpaid jobs against their will, which is negative.