>you're disregarding a large number of people for something beyond their control
What you spend your free time on is not beyond your control (at least when you're a software dev and presumably paid enough to actually have free time). And you might decide to spend it on other, unrelated hobbies. That's cool, but you should be aware that unless you can present that hobby as interesting, unless you can sell it as something that helps you grow, you are making yourself look less good that someone doing the same kind of work, and then doing OSS in their free time.
A company is not going to disregard you for not having a respectable github presence if no other candidates have a github presence either. But if there's a clear disparity, why should they take an extra risk by hiring you, rather than hire the person that can show them their actual contributions?
"at least when you're a software dev and presumably paid enough to actually have free time"
...or you know, don't have family obligations.
I do agree to some extent with what you're saying, but as others have stated, it should be one of many factors taken into consideration, and it depends on the culture the company is trying to foster.
I personally have looked at github profiles of people I'm interviewing, if they chose to share it with me.
What you spend your free time on is not beyond your control (at least when you're a software dev and presumably paid enough to actually have free time). And you might decide to spend it on other, unrelated hobbies. That's cool, but you should be aware that unless you can present that hobby as interesting, unless you can sell it as something that helps you grow, you are making yourself look less good that someone doing the same kind of work, and then doing OSS in their free time.
A company is not going to disregard you for not having a respectable github presence if no other candidates have a github presence either. But if there's a clear disparity, why should they take an extra risk by hiring you, rather than hire the person that can show them their actual contributions?