Great work! I'd consider specifying the list of criteria for significance further, in order to counteract the heavy US bias of ChatGPT and, therefore, your site. I'm not a prompt engineer, but perhaps something on relevance for people from different countries, or simply adding to your prompt a sentence on ensuring geographical diversity.
The idea of filtering news sourced mentioned elsewhere is nice, but will necessitate considerable input from users, kind of negating the purpose of the site