I don't understand your argument. It's not their core value proposition so it's crazy? That's quite a leap. But giving a good answer is just as core as their search results. The answer is what you're there for and they get to show ads. It's not any stupider to use that info than a dedicated site. Both could be wrong, and you're not a moron if it is.

Installing an app to learn a single time would be the real moron option.