(I'm the author of it)
If you mean the point of writing it, I saw a couple of people tweeting about how to find it out by searching the source of https://github.com/account whilst logged in and wondered if I could automate it. A chance to flex my HTML/JS muscles for fun if you will.
Tweeted it as a laugh and went to bed. It's had quite a nice trip through the internets since. As someone mentions elsewhere in the comments, it's interesting to compare when people signed up and their id to see how the GitHub user base has grown.
So yeah, no real point except idle curiosity and a small challenge for myself to implement it.
