GitHub is not my resume. No one has paid me to work on open source outside of a few isolated instances - I did port an RDP client to SVGAlib once.
Coding meant I will be less productive next day and besides, I was already coding a lot and getting better at it in work. I found it more rational to focus in my free time on things that job wont teach me.
If you are not tired after whole day of coding, then you was not coding intensively enough or did not had to solve difficult enough problems. Of course I can slowly hang around easy code for hours. It is different when you are trying to be as fast as possible and still not sacrifice the quality.
There's a fair amount of stuff I'd like to throw up on github since I can't put any of my work-related code up, but I have other priorities in my life, so meh. My spouse is the total opposite of me and will probably struggle to come to terms with our impending spawn sucking up his free time, but that's just how things are. I don't think there's any shame to be had to not participate in these things regardless of the reason - it has a non-zero time and effort cost that cannot be ignored.