I could imagine an extension that scrapes video metadata (if not actual video frames) and runs some FLoC-like P2P discovery mechanism for similar video content.

I could imagine an extension that scrapes video metadata (if not actual video frames) and runs some FLoC-like P2P discovery mechanism for similar video content. The main problem with this would be spam; Google has a lock on web search entirely because building a search index that is not immediately besieged by adversarial content is very difficult. Alternatively we could bring back RSS readers and aggregation. We'd need some way to scrape/feed YouTube metadata into it. Feeds could advertise related creators that way (with the caveat that this would almost certainly become a sponsorship/advertising mechanism, something something RAID Shadow Legends).