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There is white paper, there is roadmap. But very often the team of the project does not fulfil the promises from white paper and roadmap.
That is rightly said - promises. All of these roadmaps and documents are written by the project team. And they are not fixed by law. Team can always change, cancel or just forget about what they promised.
The main aim of Whitepaper and roadmap is attract investors. That is why all information in White paper and roadmap is positive, only advantages of the project.