It was a DDoS attack. Nothing to do with their infrastructure.
The company I worked for used GitHub as the source for its build systems releases. If you can't do releases because GitHub is down a few times, I'm sure the dev/ops team will start looking elsewhere.
Tomorrow Bitbucket can get under the same attack.
[1] - http://www.cloudflare.com/ddos
[2] - https://github.com/blog/1452-new-github-pages-domain-github-...
You are blaming Github for being attacked by DDOS?
And, in my experience, they'll very freely give you 1-2 month temporary packs, even if you're late with the renewals. Very good customer service.