As much hate as Brave gets overall, I think Mozilla should take a page from Brave's book if they're going to make a search engine. I think they should have their own index, possibly supplemented by Bing or Google. Let people opt-in to using their browsers to help crawl for the search engine index, like Brave does. Then add in some power-user features like goggles and custom ranking, and they'd have a pretty compelling search engine. They should even be able to subsidize it somewhat with advertising: DDG and Brave Search are the only two websites I allow ads on, because they're usually relevant and they're never intrusive.