Why do some software engineers work and think this way? There are a ton of things in society built on corporate-controlled and even proprietary languages and so

Why do some software engineers work and think this way? There are a ton of things in society built on corporate-controlled and even proprietary languages and software tools, from buildings to bridges and more. There are quite a few open-source projects and packages that I would love to be corporate controlled so that I could get some help and support that I would gladly pay for.