Earlier quoted context omitted.
Also it’s unlikely Kagi will ever become big enough for SEO people to specifically target with manipulative content. Even if they got 100 million active paying users it’d still be a tiny fraction of overall search traffic.
If anything, Kagi has proven that Googles "SEO ruined it" argument isn't valid. In the beginning, Kagi was mostly just API calls to Google and Bing AFAIK. Their results were still better for some reason, probably because they didn't have to consider how valuable the ads on garbage site were before throwing the site out of my results.
But I fear that if a large search engine copied some of Kagi's filters/lenses for non-commercial blogs & forums then SEO agencies would dedicate immense resources to polluting them.