Care to elaborate why GitHub would be a target for a state sponsored DDOS attack? Seems a little far-fetched, for a website that is virtually unknown outside of the developer community
In the broadest sense, github is a site where anyone can upload and publicize any file of reasonable size. Depending on who is uploading what, that could easily make them a target.
There's some statistic out there somewhere from some paper which found out that like 3 out of every 4 (or something ridiculous like that) cyber attack on the US government comes from China so...it's not that farfetched.