[chucke]

Browser install wizards already configure the default chosen language to the OS language, which should already be the preferred language, so I'd be very surprised if that was the reason they never bothered to fix this behaviour.

My theory is that yes, they don't lose business because of this so why fix it, but mostly because the most valuable country-markets in the world tend to be monolingual, and the US is the most profitable of them all. And everyone uses Google despite of this because well, what else?