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I'm not sure what point you're trying to make but in this context there is no difference. If you know someone is cheating, you prevent further cheating by banning them.

Now I'll ask: how do you detect someone wall hacking automatically? No human review and no false flags. Go!

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A prevention model would be like the xbox where technical measures are used to prevent user code. A detection model is server side and detects anomalies for bans.
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