If fanfic writers are "leeches, parasites and blood-suckers" then they are still leeches, parasites and blood-suckers even if the original creator doesn't object to people writing fanfic, because even if they have permission, they are still fanfic writers. If they are hired to right a derivative work, such as writing a Star Trek novel, is that uncreative? The legal status doesn't make it more or less uncreative.
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