Thinking a bit further on that angle, I wonder if there's a market for a Github-with-payments ("here's a working snapshot of my code -- it's open-source but in order to open an issue that I will look into, you need to pay me $X"). After all, it is the same way doctors or lawyers work – they aren't expected to spend their weekends doing law cases or practicing for free.
[This is part of why I also oppose the widespread "Everyone should learn to code" movements. In principle, I would like to teach people how to code, but I don't necessarily want to do this work for free. Without this nuance being addressed, the "learn to code" movements strongly devalue our industry in my opinion. Have you ever heard lawyers say "Everyone should learn basic civil law" and then offer free classes for the same? It probably happens a bit, but nowhere near the scale that happens for code.]