It is true that IEO is better than any other method of crowdfunding for now, it is very difficult for scammers to come into the IEO space since it's being regulated by the exchanges themselves and the investors don't need to keep hoping that one company somewhere that no one knows will be able to deliver after funds have been giving to them. The only ways scammers can come into the IEO space is to create their own exchange and make a lot of promises that will make people want to invest in their exchange.