that you guys do not allow us to trade "download codes of games and other digital content" is just nonsense and a shield for you that covers so many aspects, so you have that scope to say something like that.
after all - Gamestop requires you to go visit that store so you eventually purchase something there and then pick up your event pokemon.
how is allowing to trade such a thing any worse or better than not allowing us to trade free digital goodies on this site?
I could accuse tbt of stealing Gamestop Customers too, as you try to tell me that TCGO Codes are something that has a real value, when they clearly say "not to be sold".
fact is, if you purchase something or go pick it up yourself on Gamestop events, it's considered yours and you are free to do with it, whatever you want.
especially if it's being added as a free side piece to your actual purchase, that you can't make use of and decide to offer it on tbt, smogon, or wherever else.