[Suicide Junkie]

The third party thing is a big hole. You can't always trust the *maker* of the game these days, what with asinine stuff like starforce these days. God knows what a third party will do.

Besides, the IP address thing is less accurate anyways.
Especially for European stuff, where it is easy to drive to a new country with completely different language.

On the other hand, it is a given that the user can read whatever language their regional settings are set to. If you don't read Italian, your PC isn't going to be set to Italian, even if you're visiting Italy at the time.

Or, heck, you could let the user choose what language they want the ads in! You're already doing that for the game's UI, right?

The question of why there are ads in a game you already paid for anyways is a separate matter.