You can't always identify scams for sure unless they do something fraudulent. However, if you are a little alert, then most of the time you will understand which project is shady and likely to scam.
Most of the time scam projects will DM you first. they offer you various lucky things via email, telegram, and so on.
Most of the time e-scam projects come with cheap tempting offers. Samples of these offers indicate that the project is fraudulent.
They will ask you to transfer money quickly, they will not give you a chance to think. They will say time is running out and they will put pressure, again and again, to pay within 10 minutes or 20 minutes.
Scam projects can often ask you to reveal your personal secrets, such as your password, date of birth, etc.
Scam projects duplicate their profiles and never reveal the real face.
Most of the time greedy people are the victims. We need a little caution to keep ourselves safe from these scams.