In addition to what lolinder writes Kagi already gives me what we have askes for from Google for a decade or two: a way for us to punish creative SEO artists by individually downranking or outright block them.

If they start popping up in Kagis result they will bother me at most two or three times before I hit the downrank or block button and they are gone.

Why Google hasn't managed to create something similar during the last two decades I leave as an exercise for the reader.