It depends on why the library is open source. A lot of maintainers do it so they don't have to re-write everything when they change jobs. Those would generally

It depends on why the library is open source. A lot of maintainers do it so they don't have to re-write everything when they change jobs. Those would generally agree with you. Others do it for personal marketing or other economic purposes such as lock-in. Then there are maintainers who just like doing open source work and like providing something useful for many.