Filtering doesn't necessarily have to be driven by AI.

Take recipes for example. Recipes are now almost impossible to get non AI results for via search engines. But, simple hardcoded parameters that set a preference for older results, ones without affiliate links (Marginalia does this), ones with fewer than 5 domains executing javascript on the site, some analysis of the date of the domain registration and activity on the domain, some analysis of the top level domain to filter out blogspam, these would all make the search results more human.

My hope is that eventually, there will be a paradigm of search engine optimization, maybe even an open standard for the absence of excessive javascript, affiliate links, social media buttons, etc. Sites that lack those elements are way less likely to be junk.

not necessarily, i once stumbled upon an enormous ublock "ai filter" that was just a list of css rules hiding search results referencing a predefined list of ai sites