Comment by deepsquirrelnet
15 hours ago
I do not know a lot about this subject, but couldn’t you make a pretty decent index off of common crawl? It seems to me the bar is so low you wouldn’t have to have everything. Especially if your goal was not monetization with ads.
I think someone had commented on another thread about SerpAPI the other day that common crawl is quite small. It would be a start, I think the key to a good index people will use is freshness of the results. You need good recall for a search engine, precision tuning/re-ranking is not going to help otherwise.