Many will never invest any bitcoin in the projects because they do not want to lose. Bitcoin you want to save for the future, but Fiat is to be used for investments without any problems. It does not involve any risks.
When you Invest by Flat and get scammed you can easily trace their company and arrest them because scamming your money, but Bitcoin doesn't . Because Bitcoin is hard to trace (but it doesn't mean impossible to do) . That's why Bitcoin is a good field for scammer.