Why even show ads? Perhaps, it would be easier to just have Alphabet spawning a company doing SEO that triggers the right strings of the Google page ranking alg

Why even show ads? Perhaps, it would be easier to just have Alphabet spawning a company doing SEO that triggers the right strings of the Google page ranking algorithm, thus successfully putting stuff on top of search. Google still receives money, but no specific "this is an Ad" needed. At least, in that universe that would be no question on whether we can trust in "no-Ad" section of the results.