I made a few libraries while I was employed. After, built a company and made money with closed-source products. I'm still doing open-source libraries. Open sour

I made a few libraries while I was employed. After, built a company and made money with closed-source products. I'm still doing open-source libraries. Open source never made me any single dollar. A nice thing is the one library that succeeded, it brought a kind community with some shared interests, and significant contribution. This kind of RoI is hard to quantify.