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The only way to prevent behaviors, which have a proven track record of resulting in profit and power, is to create consequences which are overwhelmingly more damaging and painful than anything that might be gained from continuing that behavior.

Considering that what lies in the balance here is control over an entire nation -- arguably the wealthiest and most powerful one that ever existed -- all of the things you listed are comically and tragically inadequate to produce the result you desire.

In all the history of mankind, only one punishment has ever proven sufficient to deter treason.

it's your system (political, judicial...) that makes the cheating possible, and that urgently needs to be changed.