Comment by ocdtrekkie

The challenge is the indexing. There's probably something to be said for making a personal search engine that just ingests sources you yourself are likely to want and need, but antitrust enforcers have gone as far as considering forcing Google to share it's index with competitors to give them a chance, because the data moat is so big. Even Bing, which is likely behind large chunk of third party searches, is likely primarily sourcing its data from settings in Edge that spy on your Google searches.