Many searches are useless without including reddit.com
As an example: I was doing a search for the best sesame substitute today. Everything that came up was things like, "11 Best Sesame Substitutes," and I know for a fact that just about everything they suggested tastes nothing like sesame. Just another site trying to get hits. So I added reddit.com into my search parameters and immediately got some decent answers.
I really hate that I have to do that to get anything useful, but there is a ridiculous amount of useful information on Reddit. I hope the fediverse gets to this point as well one day.
Yes, every LLM ate reddit but LLMs aren't aren't reliable and tend to hallucinate .
On the other hand, one could train an / (ask a big enough) AI to extract useful info from each post, sort it in big categories (life style, science, mechanic,etc ) and subcategories (life tips, male clothe tips, chemistry, animal facts , car engine repair, bike engine repair ) then Do an internet search to check if there are other sources and use it to judge the reliability of the info and put it in a database that the LLM look up before answering. This condensed reddit could likely hold on a few gigs. Maybe there's a better way to do it but this is the extent of my very limited knowledge.
Bing does extract info from sites, including reddit and compare it to other sources but i doubt they're creating a database. Imagine all the wisdom, knowledge of hundreds of thousands of people but offline and only without the useless arguing and other bullshit.