One possible excuse for plagiarism, they have hire someone to write it for them and they didn't know that the one they hire just copied it somewhere else. It is s a valid excuse? I don't think so. If they don't have any reason to scam then they should get someone competent or at least try to check everything because releasing their whitepaper.
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Yes, it is possible. Now some ICO projects only want more investors, and do not want to do a good project seriously. If writing a white paper is just a task to prepare for an ICO, such this project also needs to be questioned.