[viraptor]

This gets repeated every time, but it's worth repeating: You've just discounted many skilled people working at companies which don't allow public personal projects, and people who are not interested in working on personal projects. There's a significant number of them.

[dheera]

I should rephrase -- having stuff in your Github is the best way to show you know your way around Github.

Not discounting the fact that you may have lots of other skills and nothing in your Github.

In general if someone has enough other skills and worked at companies that have a high bar, it's likely they can pick up Github fast enough even if they haven't used it that it shouldn't be a hiring concern.

Like for example, if someone is fluent in C++ or some such, I wouldn't doubt their ability to learn how to use git.