https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
I've personally spent hundreds of hours working on this, as well as tracking down voting rings of every imaginable sort. I'd never claim that our software catches everything, but I can tell you that it catches so much that I often go through the lists to find examples of good projects that people were trying ineptly to promote, and invite them to do it again in a way that is more likely to gain community interest.