I also see that there are so many coins or maybe token that is now really become a scam. From year 2018 the number of the scam ico increased and there are only few or legit ico that is now running, so I think we need to be more extra careful or choosy about ico to avoid being victimized by the scammer because I see that scammer is everywhere.
Starting from ico until they are still entered in the exchange, it actually only waits for a time where like last year the bitcoin decline caused a lot of coins and tokens that were unable to survive and eventually became dead tokens