is that true? Why are there so many IEO projects now SCAM ?,
it's terrible to see that altcoin prices are now sinking

Buddy, IEO Projects are not scam.
Exchanges are SCAM!
Do you have any evidence about that whether are IEO project is not a scam, If you are blaming about the exchange then you shouldn't on those exchanges? We have seen many IEO's who have lost their value in the market after the conclusion of their crowd sales. I am one of them who faced losing situation when I participated in IEO.