I have never thought of fake white paper, but I know of fake ICO/project. Everyone may not see white paper as been important, but if there is any other means at which details about the ICO can be conveyed it will be accepted. Not having any info may will make such ICO not be trusted.
The fake whitepaper is likely copied off from the other project's whitepaper and there are not enough tools for determining the originality of the whitepaper, as far as I know. In other means, teams don't have an idea about the project but they want to make as much the money they can with token sales. Everyone is not capable to understand the deep meaning of the project but teams have to increase their knowledge with various teaching platforms.
I see no reason to read all the white paper, as often the team does not realize any of this. I just look at the team and at the partners
But reading a whitepaper is far more important than just seeing the team and project partners, because in the team can still be made fake and in partners can also be manipulated, so reading whitepaper is also important.
If there is no reliable project, reading the whitepaper of the randomly chosen project will be as same as wasting time watching the TV. Partnerships are agreed before they publish this news on social media and the investors think about investing more to the specified project. If the investors don't have the true vision in the project, this project will live in the deep corner of the shitty exchange from my experience. Experienced traders pay attention to the whitepaper, team, the roadmap, etc. Teams also use psychological tricks for misleading the investors, this is not right move but they don't hesitate to do such dirty tricks, unfortunately.