Unfortunately, 60% 70% of the projects used to be scams, but now this number has reached 95%
You can't stop them from doing this and this is why people are now being so careful about crypto related investment. There was a time when people were so interested about ICO and token sale but its opposite now. Due to huge amount of fake peojects crypto investors are selecting exchange based IEO as safer investment option. I will not get surprise if the percentage of scam ICO projects climb to 99%.
Before selecting any ICO project its necessary to research properly which can reduce the number of scam accusation.