Interesting project what kind of technology are used in the backend what api's etc
If you want to see the detailed answer, I did it in another question below. Feel free to have a look at it!
TLDR: Curations are made with AI using custom prompts and then double-checked + added manually. The main idea behind that was to ensure the quality of the curated content. IMO, for this type of project, having less choice if the curation is good is fine, rather than having something via an API with "inconsistent" data and less relevance.