Was this game hosted in Nigeria?
If you read user agreements, for online games. Most of them have something like this:"
Security and Anti - Fraud. For security and anti-fraud purpose, the Company may require the purchaser to provide personal information such as name, address, phone number, social security number, and copy of picture ID. Purchasers may also be required to write and sign a statement certifying that their purchases are real and valid. Failure to do so may result in suspension of the purchaser's Account.
Basicly comes down too, that they have all the rights...
So if a game has a rule that is against multi accounting.... and you have 1 account that is your own, but another account is been logged in from the same IP... but has diffrent personal details. They can enforce this rule, by suspecting you having a hacked 2nd account. If you catch my drift.
If they dont trust your accounts, they can always throw up some BS security reason... and you will have to send in your details
For example. Online Poker games. Multi accounting
GG hehe
*edit* Game was called Trivian