There's probably some debate around whether this is nefarious or genius, but I'd lead towards the later. "google" has always been one of the number one search terms, and the amount of people who would open chrome, search for google in the address bar, then open google in the google search results, then do their search, was wild. There's a very large percentage of less technical people who aren't looking for Google, they're looking for search, and in their mind the two are the same.
They likely don't care what search engine they're using, so I suspect this actually captures a very large amount of search volume, while still solving the intent of the user.