Well, I think a lot of the uptick happened last week because that's when it was published in the Toughtworks Tech Radar for this quarter. The audience is large, presumably larger than HN, and that's how I found out about it and have been toying with it since then. I have no idea what I'm doing, but as far as I can tell, this seems like a legitimate project.
I created insights for the last 4 weeks and number of new contributors and stars peaked last week. This project has all the signs of a successfully organically grown project.