Those who are buying them are already aware of the terms mentioned here : https://aws.amazon.com/awscredits/
it is same for all the coupons sold on this forum. all of them !! Very Important paragraph. Mainly it concerns to your misappropriated codes1.9. Promotional Credit is valid for a limited time only and expires on the date indicated when you receive the applicable Promotional Credit code (or such other date designated by AWS). Failure to use Promotional Credit before such expiration date will result in the forfeiture of Promotional Credit. We reserve the right to cancel Promotional Credit at any time. No refunds will be granted for any expired or cancelled Promotional Credit.
You're just another ignorant who wants to steal a few dollars