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 ?
I would say that the project is a scam if
1. the team has no response
2. the team never updates on the progress of the project
3. the project did not go according to the roadmap and whitepaper
4. the team always promises but does not keep what was promised
5. the team is not transparent about the total supply of coin in the project