The answer is a combination of:
* somebody submitted it
* people upvoted it
* the algorithm weights new more than old
* lots of people have things to say about it, including recommendations for other tools, neat hacks, and observations on general utility
https://stallman.org/articles/on-hacking.html
Not to mention posts like these.
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
More here: https://news.ycombinator.com/item?id=21755721