The BigQuery dataset is entirely 3rd party, based on the public HN data (presumably via the HN Firebase API - https://github.com/HackerNews/API), so anyone is free to do this.
a bit off topic: is there a way to display a HN page using the firebase API/sdk without doing N+1 requests ?
(sorry for noob question)
No, unfortunately. We're going to make a new API that will be much easier, but there's at least one other major project that needs to get done first.
Thanks for the response!
Yes, that’s how it works. Same data as in the API.