Given that it's rather easy to use a credit card with an assumed name, and also a fake billing address submitted while paying, I really don't see why the people who wanted to stay discreet/anonymous didn't do so.
In case anyone wanted to know how to do it, at least in the U.S. it's rather trivial:
1. Add an authorized user on your credit card account. The name can be fake. You'll get a card for that user.
2. Add a throwaway billing burner phone number on your account. Can be a $5 Tracfone from Walmart. This is optional only if the billing processor demands a phone number.
3. When registering/paying for AM, use the fake authorized user's card, and enter your address with a wrong name of the street. The ZIP and house number must match, the street name doesn't have to. The phone number should be the burner phone.
If the hackers get your data, all they have dirt on is a fictional character. This is 21st century, I thought every guy who knows how to use a bank account and a computer would know this shit?