This is from the bundlestars Nemesis 2 bundle which claims:

This Product will NOT activate in the following regions:
Afghanistan, Brunei Darussalam, Cambodia, Cuba, Hong Kong, Indonesia, Iran, Islamic Republic of, Iraq, Israel, Japan, Korea, Democratic People's Republic of, Korea, Republic of, Lao People's Democratic Republic, Macao, Malaysia, Philippines, Singapore, Sudan, Taiwan, Province of China, Thailand, Viet Nam.

There's no option for this in creating a giveaway and I don't even know if it applies to all the games, but please be aware. I may ask for a reroll if the winner is from one of these regions.