[lomnakkus]

> Who tried and convicted him?

This is not a court of law. People have a right to (and do!) form their own opinions without going through the courts. Calling something a scam does not require a legal judgment, AFAIK... unless you want to argue that it would be slander/libelous to do so. However, this would probably be a tough sell since saying "X is a scam" in everyday life would probably be interpreted (for legal purposes) as saying "It is my opinion that X is a scam" and opinions cannot be slander/libelous AFAIK.