Out of the hundred or so resumes I have worked with at this point the handful that have had their github up that I had time to look at were net-zero or net-negative as an addendum of their resume. There's a difference between an engineer with a history of open source and one that 'did something and pushed to github', and most entry-level engineers haven't had such a strong history of open source that what you see of them would be meaningful anyway. I do try to preach this to what developers I come across but there's only so much that can be done.