This happened because the ICO market is no matter how regulated. Ie no one is responsible. And since money appeared in this area, scammers also appeared automatically.
Fraudsters have always been, are and will be in any industry. Every day, their tricks are becoming more sophisticated. Therefore it is necessary to be very careful and circumspect.
Ideally, this system should look like this: the investor invests in the project and sees where the money is spent. If the project does not fulfill its obligations, the investor can return his money immediately. Thus, there will be more confidence in the ICO.