This is not relevant to your point but I want to say that's an entirely third party project and we didn't even know about it for a long time. We don't publish data to them except in the sense that we publish it to everybody: https://github.com/HackerNews/API.
I think their page gives a misleading impression that the project is somehow official, when it's not (https://news.ycombinator.com/item?id=43850991).
Thanks for the clarification dang. I was misled by the listing which lists the author/publisher as "Y Combinator". Thanks for offering the official API.
I would like to add that the fact that there is an API does not mean that you as an API consumer have rights to the content that comes out of the API. Simplified, everyone participating on HN holds the copyright to the content they've created, so comments, submissions, etc, HN holds a perpetual license to that content, you don't hold any rights to it.