A Ponzi scheme is a special kind of fraud. It is based on a fake investment that one schemer (or group of schemers) gets other people to give money to.In Ponzi schemes, the schemer basically says, "I found a great way to make money fast. The more you give me, the more I can invest in that cause, and the more I can earn for us all". But a Ponzi scheme doesn't actually "earn money". Instead, all of the scheme's money comes from the investors.
Once a Ponzi scheme gets too many investors, the system will always crash. This is because the investors all expect more money than they invested, and they will get impatient.
So as we can see, I fail to understand where bitcoin fits in that process as the currency started at 8 cents for each unit.