That's not what the second link says is happening though.
My reading of the second article is that there is the following problem. Website G2A.com allows private re-sale of game keys, whether that's to undercut the retail prices or avoid region locking or whatever is irrelevant. Carders are constantly on the lookout for ways to cash out stolen credit card numbers. Because fraudulent card purchases can be rolled back and because you have to go through ID verification to accept cards, spending them at their own shops doesn't work - craftier schemes are needed.
So what they do is go online and buy game activation keys in bulk with stolen cards. They know it will take time for the legit owners of the cards to notice and charge back the purchase. Then they go to G2A.com and sell the keys at cut-down prices to people who know they are obtaining keys from a dodgy backstreet source, either they sell for hard-to-reverse payment methods like Western Union or they just bet that nobody wants to file a complaint with PayPal saying they got ripped off trying to buy a $60 game for $5 on a forum known for piracy and unauthorised distribution.
Then what happens? Well, the game reseller gets delivered a list of card chargebacks by their banks and are told they have a limited amount of time to get the chargeback problem under control. Otherwise they will get cut off and not be able to accept credit card payments any more. The only available route to Ubisoft or whoever at this point is to revoke the stolen keys to try and kill the demand for the carded keys.
If that reading is correct then Ubisoft aren't to blame here. They can't just let this trade continue or it threatens their ability to accept legitimate card payments.