You're talking about criminal law here, which is completely irrelevent, and would be irrelevent even were this a legal case - even if TopMudSites had taken legal action, Vassago would not be in any danger of being imprisoned or executed simply for cheating.
While a criminal case has to be proved "beyond reasonable doubt", a civil case such as this would be would only have to be proven on the "balance of probabilities" - in other words, it would only have to be proven "likely" that Vassago was guilty. Such evidence has already been presented, and so the would have shifted to Vassago.
See here:
"Non-criminal in nature, civil cases involve conflicts between parties over property rights, personal injury, breech of contract, and the like. In these cases, the plaintiff carries the burden of proof and must demonstrate their version of the facts to be true by a preponderance of evidence. In layman’s terms, this burden of proof requires that the defendant prove that their argument is more likely to be true than false. This is also called the balance of probabilities. When a plaintiff wins a civil case, the courts will typically order the defendant to compensate the plaintiff for their damages."
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