Actually, forgers don't need to do anything extraordinary to produce these fake cards. According to the article that OP links to at the beginning, they just pus

Actually, forgers don't need to do anything extraordinary to produce these fake cards. According to the article that OP links to at the beginning, they just push some buttons on the same machines that make genuine cards. The same thing occurs in counterfeit DVDs. The tell-tale sign is when the factory-identifying marks have been ground off from the clear middle plastic part of the DVD. I believe these are sometimes also called overruns, and it affects basically every industry out there, from electronics through to handbags.