That doesn't even make sense. SEOs exist to make sure websites are more consumable by bots for search indexing. They likely have no backend experience or much experience working directly with css/html, and are more likely dealing with full stack developers who have no desire to understand how their code is functional for users but isn't consumable by bots. The most successful deal with brick and mortar companies which require actual capital to create and not just SEO skillz, and anyone with a brain would know dropshipping is so 2014 (there's like a million of these failed journeys documented on random boards like blackhatworld where people try to monetize search like you suggested, but it's a hella minority because we are deep into the enshittification of search). SEO is important to deal with things like the proliferation of angular 1, which was a hellhole abyss for startups in search because google wouldn't index their shit and developers needed to iterate fast. Hell, a large part of the react community is based around things like server side rendering just to get around google bot refusing to let JavaScript load and search results were polluted with handlebars variables for years because of that. Google bot still has problem rendering webpages while I do all of that shit all day with google's own puppeteer.

Tl;dr: SEOs are a cottage industry to help companies deal with the ongoing enshittification of search, and basing their value or success on whether they could launch their own site isn't a good benchmark.