By your own definition, you too broke the guideline by sending your retaliatory feedback despite never having a trade. Two wrongs don't make a right (though the first wasn't a wrong, to begin with).

If we are not allowed to place prophylactic feedback ratings then are we to wait until after scammers steal from their victims to warn others about their behavior? It doesn't exactly make sense here.

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And wait, isn't Lauda = theymos? How would they possibly ban Lauda?