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I don't know if they abuse their power there are consequences for them or not. But they are members with special powers who work like forum police and make the forum better even though sometimes there are members who complain because they feel discriminated against due to wrongful accusations.
Maybe, but someone not a DT member also has the unseen power (ratings sent) to contribute to the abuse. A good step is to avoid forum drama as much as possible, or use the "ignore" button if you are already involved in a personal problem.
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Regarding the source of merit, I have never had a problem sending your merit to anyone, as it is your right, but this person seems especially nice
Yes, and much more. You can go
this thread to monitor the most generous Smeriter.