Ironically, I was looking to see whether Hacker News and anyone else had picked it up, from the FediVerse post. Bing found the Reddit thread from "One Million Checkboxes" as the search query. It's the second search result as I type this.
Other interesting Bing search results are Arnold Trakhtenberg's re-creation of the WWW site code using Convex, at https://github.com/atrakh/one-million-checkboxes .
https://www.reddit.com/r/InternetIsBeautiful/comments/1dp4t7...
By the way, Reddit allows you to track which communities a domain has been shared in, very interesting. This is how I quickly found it:
https://www.reddit.com/domain/onemillioncheckboxes.com/