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Additionnally, it is written in the Onboarding page, which you should have received in your welcome email, not to copy content straight from outside sources. (ctrl+f "Likewise, when you start writing, please do not copy content straight from outside sources — we don't need to plagiarize!")
It's not Wikipedia specifically so much as it is not copying content without at least rewriting it to fit our tone and subject matter. I'm not saying this is what happened to the PLO and Hezbollah articles, I just want to clarify that we don't target Wikipedia only.