It would make it fair for everyone EU and US
From what I've heard even some US players didn't get the codes because they ran out of codes
Seems like greedy people abused this promotion to make easy money and sell these codes for 40~80$ on virtual shops.
It happned before with your kung fu tea thingy promotion and now its happening again.
Just sell it for 0 gems, that way everyone will enjoy and obtain it and the people who were greedy enough to make dozens of users will get absolutely nothing.
Reward your playerbase and punish the exploiters seems like a fair deal right?!