There are many projects with crappy team members that just want to make money and do nothing, they are the type that enjoy stealing someone else work and rebranding to their own, it's a very bad act and such projects are considered a red flag if you detect any of these bad acts.
Most projects will copy from the whitepaper before, but there are always mistakes because they forget to replace, if this happens then it is better to leave the project, they will deceive us and of course we must be selective before being fooled, this has often happened and better participate expert advice.
Plagiarism has become the main reason why it must be marked as a scam project. I have seen so many scam projects were always only copy and past whitepaper from another project. The fact that if these days people are always seeing the project that did plagiarism as a scam project no matter what happened with it. That's why people are always try to research whether the whitepaper was plagiarizing from another project or not.