At a point the team start given excuses to abide by what they promised to do or stop communicating with the community then I can sense the project is scam. How do you determine a project is gone bad and won't fulfil it promise? What criteria do you use ? or you wait for years thinking all will be well ?
Promise and excuses is part of alibi of the team project if didn't want pay investor and participants and after the excuses and the promises the team disaffair.
Always late to,realize the is scam because all project look have pretty great white paper to encourage people to invest become getting scam the project is over.