Thanks for letting me know that I'am the dumb one here , appreciate it .
Also you said "Google automatically adds $100 in Free Credit to your account 2-3 days after your campaign reaches $25 in clicks." and there is no one in hell that this sentence means that you should spend using your credit card .
Secondly ... They are free coupons "for years" as you said , so why you are selling them ?
If you don't like this one I have adwords coupons from Australia. You do not need to spend $25 on your credit card using those coupons.