Actually, quite randomly, in recent times 😅
nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 is revolutionising some fetching/caching-related areas right now, so things should improve.
Discussion
Are there hashtag feeds? Hashtag+ relay? Hashtag+npub?
No, would be a nice option; but I fear that hashtags are too prone to spam for a relay feed, so without a WoT filter or something similar, the rss would be quite pointless.
Instead it could work for a npub, or a private/paid relay.
Yes hashtag+npub and maybe relat could be useful, hashtag on public relay not so much