The basic underlying idea behind the use and creation of cryptocurrency is to present financial freedom to everybody no matter where you find yourself in this world. But the volatile nature of these digital currencies got me thinking, what if the whole idea of blockchain and cryptocurrency is just one giant Ponzi Scheme? Within a short period of time, there have been about thousands of cryptocurrencies created. Majority of these digital currencies are either trying to solve problems of a particular cryptocurrency by presenting solutions they think can help improve financial freedom. This usually gets me wondering and thinking. If you don't agree with me on this, please share your thoughts... 
Some of my friends who are in your thinking have lost money from their investment in crypto currency as a result of the market rise in 2017 and that was why they are of the believe that Bitcoin is a ponzi scheme which is not so if you read from the definition of ponzi provided above by some of the respondent.