This bridge is trying to get Mastodon and BlueSky to exchange information… https://techcrunch.com/2024/02/14/bluesky-and-mastodon-users-are-having-a-fight-that-could-shape-the-next-generation-of-social-media/

Would need human curation to select the best websites in each field.

I think the biggest challenge will be to standardize the scraping process since databases for audiovisual content are very differently structured. Will probably require database-by-database API access/negotiations so that you know how their databases are structured - completely FOSS audiovisual content databases are rare.

I was referring to that you could take ideas regarding UX/UI from it.

https://www.kenmei.co/ may be close to what you want for manga.