How will AI tools know which sources are "valid"? It's likely SEO will transform into ways of tricking bots scraping training data into considering their inform

How will AI tools know which sources are "valid"? It's likely SEO will transform into ways of tricking bots scraping training data into considering their information as being more "valid". Alternative search engines must rely on AI themselves to filter out good results, or some form of manual curation by humans, like Kagi's boost/block/pin feature.