Way back in 2007, Doc Searls turned me on to this quote:
Currently, the predominant business model for commercial search engines is advertising. The goals of the advertising business model do not always correspond to providing quality search to users. — The Anatomy of a Large-Scale Hypertextual Web Search Engine, Sergey Brin and Lawrence Page.
I revisit it every few years and think about Google. It was ironic then and only gets better.