Ok, so everybody can make a currency, keep some for them (directly or indirectly), convince people to use it, making it scarce and making the value of it grow.

Ok, so everybody can make a currency, keep some for them (directly or indirectly), convince people to use it, making it scarce and making the value of it grow. Great idea! How couldn't we think about it before! Let's start with a small group (technical people, in case of cryptocurrencies) that are idealists and full of goodwill. Then we'll pack the idea as the world's salvation from stupid governments and fees. Don't be evil! Meanwhile my (fat) share of myCurrency is getting value exponentially.