I'm not sure I understand your response. Discerning the intent of a search is completely orthogonal to whether to serve advertisements. Search engines are gen

I'm not sure I understand your response. Discerning the intent of a search is completely orthogonal to whether to serve advertisements. Search engines are generally not great at discerning the intent of a search. For example they frequently return irrelevant results that don't match key words even when you ask for a literal search. This has been discussed a lot. But that's an unrelated issue to whether the search should return advertisements in addition to search results.