indeed many scam ico that stole the investors money. but not all ico are scam.
if you manage to invest in a good ico, you will have great ROI later.
There are good, there are bad, and there are simply losers. The last two options are succeeding in the market. Therefore, everyone believes that the bench a lot, in fact, some projects practice instantaneous transfer of investment in the case and after the failure can not return anything.