Cryptocurrency is a revolution in the transaction but also used them to hold a major Scam.
ICO is a round of public fundraising, usually launched by a technical startup. The startup sells cryptocurrency tokens to investors; investors buy in the hope that the company will develop into a large business, which will increase the price of tokens.
There are no exact promises that ICO will turn into a good business. Investors are forced to give credit of trust together with their money. This is where the Scam begins.