To commit fraud, you have to intentionally mislead people with the purpose of causing harm to them, and it has to be proven beyond a reasonable doubt in a court of law since it would be a criminal case(at least in the US). This is not intentional, it is a bug/error with their billing system. Many other corporations across the world have had problems with accidential credit card billing. 99.9% of them never get charged with fraud. Why? Because it was accidential and they remedied the issue in a (somewhat) timely fashion.

Heck, it's not even the first MMO to have such problems. Tabula Rasa and Hellgate most recently, if I was ambitious I would look up more.

Yes, they messed up. They deserve to be ridiculed and criticized for their mistake. They do not deserve to be called a villian or thief for it (Unless, by some obscure chance it is discovered to be intentional, in which case I will recind my statements).