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Trust has nothing to do with scamming, or transactions, or theft, or lying.
Trust has to do with whether others believe that the person using that ID on this forum has acted in an ethical, moral, reliable, and otherwise "trustworthy" manner.
If people believe that the things you have said or done are an indication that you are unethical, immoral, unreliable, or otherwise untrustworthy, then they will leave you negative trust with an explanation of why so that others can decide for themselves if they want to risk trusting you in any manner.