Which displays ads next to the search results, which makes MS money. Coincidence? I think not.
Though as Hanlon's Razer said: "Never attribute to malice that which is adequately explained by stupidity."
Part of me wants Microsoft to be so evil they have deliberately made the start menu search so impossibly poor that you end up opening a web search half the time and making them money. But I know deep down, that they are just incompetent and can't be bothered with the desktop anymore.