It is actually very simple to regain investor confidence, it is necessary that the products of cryptocurrency startups are applicable in real life, thats all. And scammers will always be where there is money, there are scammers.
It is not as simple as saying. For most crypto startups, it seems impossible to do what they declared.
Many startups declared a lot of different things only to attract money during IEO. After that they forget what they promise.