>(1) completely insignificant wrt to the whole user base and At any one time, there's got to be tens of millions of people accessing Google from a country whic

>(1) completely insignificant wrt to the whole user base and At any one time, there's got to be tens of millions of people accessing Google from a country which has a primary language unknown to the traveller. Even if this number is insignificant compared to Google's full user base, the cost for Google to service 20-30mn people with a feature is presumably lower than their annual ad revenues across 20-30mn people.