Giving away so much discount to their target investors and promising a big exchange.
This are the basic promise of those scam ICO, BUt that are just speculation.
We will always see those scammers at the end if their ICO.
Most people are very wise now not to allow this tactics of luring them with huge rewards to get them carried away again and I think scammers will need to be wiser again now to deal with the existing and new developers as they will not easily give up their money to all these cheap methods.
Most investors nowadays makes sure that they first do their thorough investigation on the project and one of the check is to run a very thorough background check on the team, if the team can be verified and found to be worthy of peoples investment, I believe that there is possibility of the project surviving in the future, and another criteria is to run analysis check on the choice of product also, and see if it is a product that is going to be really useful to the public at the end of its release.