"SEO spammers being more advanced than multi-billion-dollar search conglomerate" is a myth. Spam sites have an obvious objective: display ads, shill affiliate links or sell products. All these have to be visible, since an ad or product you can't see/buy is worthless. It is trivial to train a classifier to detect these.
But let's play devil's advocate and say you are right and spammers are successfully outsmarting Google - well, Kagi does use Google results via SerpAPI by their own admission, meaning they too should have those spam results. Yet they somehow manage to filter them out with a fraction of the resources available to Google itself with no negative impact on search quality.
But let's play devil's advocate and say you are right and spammers are successfully outsmarting Google - well, Kagi does use Google results via SerpAPI by their own admission, meaning they too should have those spam results. Yet they somehow manage to filter them out with a fraction of the resources available to Google itself with no negative impact on search quality.