It's a little unfair to say that Kagi "does that" and thereby imply that they merely repackage search results from Google and Bing. Kagi uses an array of different search sources that includes Google, DuckDuckGo, Apple, Wikipedia, Wolfram Alpha, and others, alongside their own small web crawlers. Their mission is to present search results in a user centric way and so they try to surface results that are directly useful to the user rather than the advertisers (they don't have advertising partners as far as I can tell), and correspondingly their business model supports that approach rather than being in conflict with it.
https://help.kagi.com/kagi/search-details/search-sources.htm...