How on Earth do the gamers get the other player's actual physical location? Is it IP? I thought that could get you close but not an exact address. And, more importantly, what can people playing online do to prevent their address from leaking?
Google the hopefully unique username.
Find the first and or last name (Facebook).
Find the state and or city.
If you have the name and the city you can find the address.
My friend's 11 year old is already in THE database.
If you search for his first and last name and city you get his parent's address and home phone number.
Welcome to the Brave New World!