As someone on the hiring side, Github projects only matter when they show impact via serious industry adoption (this is not sufficient, leftPad won't get you hired).

The problem is that a Github repo is too much time an effort to evaluate on technical merits. And even if the work is good, how fast can you do it? Some people turn out good work at 1/3 the rate their peers, I don't want to hire them. Between other parts of the evaluation I can give the repo 30-60 minutes max, just not enough time.