>> Genuine question, is there any other professional field in the world where people work for free like how Software Engineers work in open source? Woodworking

>> Genuine question, is there any other professional field in the world where people work for free like how Software Engineers work in open source? Woodworking, restoring old cars, building airplanes. These are all things that people do for themselves at their own cost. The difference is that software has a marginal cost of zero, so they hand it out to everyone and collaborate to make it better.