Yes this is scam as this contest is host through your community accounts and prize distribution also done through community account.You didn't felt the plagiarism in that all winner post. This community is just promoting the plagiarism in steemit platform.details you get through @xaviduran post
https://steemit.com/hive-152587/@xaviduran/horrible-deception-case-of-plagiarism-inside-our-platform
@endingplagiarism please take strict action against this community