In terms of traditional web links, which year after year have become less and less of the search results page, yes, we primarily use Bing as an input in the same way Kagi primarily uses Google as an input. As Vlad has said publicly (most recently heard him on The Talk Show) and has been made clear from the US v Google case, it costs upwards of a billion dollars a year to maintain a competitive index of web links. Only the biggest companies can afford that. Nevertheless, we still work on crawling and indexing, but the reality is small companies can not do it all themselves.