No one said it has to be your job or passion. I've fixed a couple of areas in OSM, but I've probably spent no more than a few hours working on it in total.
> It the same argument when someone talks about an issue with an open source software. The response is, “The source code is available, go fix it yourself.” It doesn’t work that way for anything but trivial issues.
Fixing a map for a locale you're familiar with is orders of magnitude easier than fixing a bug in an unfamiliar codebase potentially built with unfamiliar technology. That's assuming you know how to code in the first place.