That's a good point but that's the case with all fraud because the digital tokens have to be converted back into fiat at some point. FTT was created without much oversight because no one had enough experience to properly audit anomalous activity. Presumably someone can trace all the fraudulent FTT transactions because it's all public but it doesn't seem like anyone has actually managed to do that. Everyone knows the money is gone but no one knows how that happened and through which FTT transactions.