I agree its not an easy task, but when you have an experience in copywriting, I have been doing this way before cryptocurrency and bitcoin. Over 8 years experience now and still counting doing research, writing reports, business plans and whitepapers. The art or science of writing ICO or STO whitepaper becomes easy plus each project is different thus the need to carefully understand what your client want's is key. In order to achieve this I will engage my clients via email, call or text to try and grasp what their project is about and what needs to be achieved. Plagiarism is just an act of laziness and incompetence  when you know all these and do it day in day out.
Thank you for your comment and good luck to you too! Wink