when investors and the crypto community already believed, but the team said differently!
- The team did not respond well to the crypto community.
- The team is very shady and does not provide updates about their projects on the telegram & social media channels.
- The team plans to take a vacation
- The team blocked accounts one by one from each community who questioned about the development of the project.
- and finally
you are banned in this group 
it's so annoying, how you feel?

Well, these are good parts of the characteristics or red flags towards a bad project. However, some may not even do these and still turn out to be fraudulent at the end of the day.
One thing we should also look out for is "unrealistic promises or vision"
Don't fall easily for some seems impossible promises of some projects. When you observe critically and you are able to conclude that the promise or mission of that project seem to be unrealistic, then it is a red flag on it's own.