Which I feel honestly in part explains why so many prominent figures in Free software development seem to have some mental issues to be honest. They in a way remind me of that person who at one point was responsible for over half of all edits on the Scots Wikipedia.
Even the paid professionals often started to work for free and then were hired by some company and the reality is that someone who is good at something and willing to do it for free is either a very good Samaritan, or there is some other issue at stake and in the end prominent free software figures often have fairly heated public keyboard wars over things with each other and most of all seem strangely fiercely loyal tribalists who suffer from an extreme case of n.i.h.-syndrome.
Some people just want to contribute to a common cause. Some people just want to spend five minutes of their time to fix that one annoying papercut which been bothering them for ages, others just enjoy working together with friendly people to achieve something tangible they can be proud of.
In my opinion one of the biggest benefits of Github to the open-source community is that contributing now has extremely low barriers. It is absolutely trivial to put an "edit this page" link in your documentation which lets a complete stranger fix a typo and open a pull request within seconds - and seeing your fix go live within a few hours is absolutely magical. That kind of trivial contribution is a gateway drug to becoming a valued community member, and it is absolutely essential to maintaining a healthy ecosystem around open-source projects.
Even the paid professionals often started to work for free and then were hired by some company and the reality is that someone who is good at something and willing to do it for free is either a very good Samaritan, or there is some other issue at stake and in the end prominent free software figures often have fairly heated public keyboard wars over things with each other and most of all seem strangely fiercely loyal tribalists who suffer from an extreme case of n.i.h.-syndrome.