I fought this for a while, then gave in and spruced it up a bit (I mostly commit to private repos not on Github). The argument "If you don't have open repos you don't write code in your free time and are therefore probably not very good at coding" is full of gigantic holes. But, I get that everyone has their little arbitrary things they use to whittle down the herd of candidates.
I'm not doing LinkedIn, though. I'm not.