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I was shocked when a client told me recently that some other "content writers" submitted articles created by copy pasting a number of paragraphs from different sources. I am aware that some cheaters use article spinning software and try to plagiarize whole articles, but stealing bits from different authors is just as despicable.
These people give genuine freelance writers like us a bad name.
Most clients and article websites will use a plagiarism checker that shows what these cheats are doing, so in the end they do not get paid.