There are services for people to do online research for you (e.g. https://wonderlib.com/), so I think it's fair to pay for a search engine that directly gives you highly relevant (and as you suggest, human-curated) results.
Whoa, did not know that such services exist. Thanks for link.
I would say that https://getmagicnow.com/ could also be considered as a kind of paid natural language search engine (limited to paid product or services).
Yeah, totally. I thought that Magic is on demand search engine for human intelligence as well. Not sure that it would easily scale though. Seems like database would be better than on-demand. Thanks for the insight.