With Kagi’s customers being users, not advertisers, they can put in features to mitigate against problems caused by SEO, like how Kagi bundles up all the “Top X abcdefg” lists that turned Google into trash.
If that becomes a problem, they can alter the plan. Kagi doesn’t have the same conflict as pretty much every other search engine when evaluating this stuff. If it starts making things worse, stop factoring it in, or reduce the influence in the ranking.