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I've unbanned a few users for plagiarism. A feature was added where we can issue a signature ban instead and sometimes that is employed. It depends on the level of plagiarism as well. Sometimes people were permabanned for just one instance which is pretty harsh. For those that did it en masse though it's a different story.
That's kind of the you. But for those who get a signature ban is there any possibility of such user to get pardoned in the nearest future if he or she actively participate in making the forum busy by sharing ideas and making meaningful posts that would increase knowledge of bitcoin and other cryprocurrencies?