The whitepaper is often regarded as the face of the project. Thats where you, at least theoretically, find out what the project is all about, what they want to do, how they want to do it, and, most importantly, when. A decent whitepaper takes serious effort: thorough market research, design work, calculations, conceptual development, and lots of other things are integral parts of a good paper. As a result, writing a good whitepaper usually requires a lot of time (and sometimes money), which scammers cannot afford.
but you need to remember,Good projects are quite thorough about their whitepapers in a good way. If you have too many questions after reading a whitepaper, it definitely means that it was a bad one, and the project did not make an effort to be clear enough. It doesnt matter if it was intentional or just a result of little attention paid to making the whitepaper, its still a bad sign.
the point is this, if you see that a projects whitepaper is sloppy, too generalized, or lacks any realistic roadmap, that should make you cautious. At very best, the project might not be a scam but theyre still not taking their work seriously enough. Nevertheless, usually, scammers either hire foreign students who dont speak good enough English to write their whitepapers, which results in a cornucopia of hilariously silly errors or they just plagiarize someone elses work, which is even cheaper (but certainly more obvious).
correction if I'm wrong
Yes, may the team not professional to write whitepaper, but there are a lot of way to make whitepaper look profitional, they can use outsource, freelancer help to write whitepaper in professional way.