They may have been embellishing that claim; however, I think what they were getting at is that in some situations using the chargeback mechanism can have wider repercussions. For example: if you are "ripped off" through Steam on a particular purchase and use a chargeback, they may shut down your account. In that case, you would lose access to all of your games purchased through Steam. Similarly, if you use a chargeback with a Google Play Store purchase you may lose access to your entire Google Account.