Determining whether a project is a scam is really hard, but here are some of my criteria:
+ Website is poorly completed;
+ Whitepaper is plagiarism as you said, or of poor quality;
+ Unable to verify the identity of the team;
+ Activities on Facebook/Twitter are not numerous;
+ Do not participate in events in the crypto world;
+ Providing unreasonable profits;
+ Using a lot of false information to deceive investors;
+ Using deceptive advertising tools;