There are cross-site video search engines. Even Google, Bing, DDG, etc have a "video" tab in the search results. I don't know how decentralized recommendations

There are cross-site video search engines. Even Google, Bing, DDG, etc have a "video" tab in the search results. I don't know how decentralized recommendations would work beyond a simple keyword search. They're kinda subjective, so I think that's easier to do with people making curated lists instead of something automated.