I agree with you to some extent. For example, there's no reason I can think of why Google couldn't allow user selected domain blacklisting or custom bangs.
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.
Small Web is non commercial sites only, by definition. And the list of included sites is manually curated. There is nothing SEO can do to infiltrate it.
