No, you're saying you want an excuse not to hire people who don't contribute to open source on your favorite source hosting site.
My corporate contributions almost certainly will never leave the purview of the company servers. Ergo, if I ever want to show code samples, I will have to write them at home, on my own time.
Certain others with an odd veneration for Github seem to be saying otherwise (see kfalter's post on another subthread), but they are not a majority.