Isn't Nostr band already a bit like search engine? 😅
Discussion
not a nostr search tool but rather a decentralized google replacement
If more content is on Nostr, then by default it can replace Google, but that will be kind of centralized again
But if you mean truly decentralised search like you being given a choice of many different search algos, think it will take time
Sounds like something that would essentially search relays for content, no matter what kind.