According to https://hn.algolia.com/

"show hn" "nft" - 151 results

"show hn" "blockchain" - 479 results

"show hn" "crypto" - 782 results

"show hn" "llm" - 2,363 results

"show hn" "ai" - 13,128 results

Well, damn. That's a pretty clear answer!

trends, as in, trendy, as in fashionable, as in topic du jour.

trends or trendy does not imply substance.

I’m surprised blockchain is only 479

You missed rust and go from your list. (-:

I had the same thought about crypto/NFTs... Before AI exploded it seemed like that was the "big topic" on HN for a long time. But there may have been less Show HNs for crypto since it has fewer applications.

I would guess higher.

Only a subset of people were, and still are were involved in Crypto, whereas LLM is of use to pretty much everyone.

As a seismic change, of course it's going to be everywhere till the hype cycle flattens.