The cryptocurrency idea is to create a free worldwide decentralized ecosystem. Free for all, for honest but also for dishonest people. It is free market and you should protect yourself before losing your money. You don´t like it? Then you do not understand crypto.
There is positive and negative impact on everything on the world's. So crypto-currency world would not different from it. Many scammer getting opportunity decentralization of crypto-currency. And most of scams happend on ICO section. That's was investors falt, because they didn't look right left when they see a ICO. Greedy behaviour just forced to invest and eventually they lost fund. Unfortunately seems still investors are investing ICO, so how can we expect that we might reduce scammer. ICO is an easy method for scammer to raise funds. But we take it seriously and do own diligence before put our money on any ICO.