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 ?
When a team focuses more on ico sales and keeps introducing series of bonuses to lure investors instead of focusing on the product development and how to ensure it contributes to enhancing the technology and blockchain sphere
I think it's not about scams, because the project team consists of many people, they split up into groups like product development, marketing groups, support groups, ...