Those are only certain types of fraud. There are others that are not covered. For instance, someone stole my wife's credit card information and bought nearly $3k worth of stuff from various stores. The company refused to cover it. Apparently once your loss exceeds a certain amount, they suddenly become much less willing.
If someone somehow lost 11.6M due to credit card fraud, I seriously doubt they'd get their money back.
You are not liable for credit card fraud in your name in the us. You should have been able to refuse to pay. That sounds shady that the company tricked you into making them whole for something you aren't liable for.
You do realize that using credit cards is completely irrelevant to trading in a regulated marketplace? The closest connection is that both are parts of the financial system, but that’s about it.
If someone somehow lost 11.6M due to credit card fraud, I seriously doubt they'd get their money back.