It is important to know that for any project hoping to convince investors into putting their money into the project, they are going to be focused on making the project as appealing as possible which means that the project's whitepaper will surely be good so I believe you should look beyond the projects whitepaper to decide if a project is legit or not.
Always make through research of a project's team, road map and token metrics to decide which projects to invest in
The whitepaper just a concept and it can't be trusted and i have seen so many projects are changing the roadmap and make it different with all of the roadmap that has already stated on its whitepaper. Whitepaper is a media that makes the developers can explain their concept to build the future product. Whitepaper can't determine how good the project is.