This has nothing to do with relay feeds as such though. A lot of the current relays that focus on this stuff are themselves communities, or something close to it; and its roughly the same group of people doing that. But what if you ask some LLM to categorize all events it can get its hands on, and curates them into seperate topic based feeds, with it running a batch every day to update it. Just spitballing but my point is, the nature of the feed itself and how it came to be can be anything.