It shows a fundamental lack of ability to do basic research into something you don’t understand, before making any broad assertions about it. When you understand the technology behind Bitcoin and the reason it was invented, you will see that it is actually the total opposite of a Ponzi scheme. Absolutely nothing about Bitcoin is a secret. It is one of the most open technologies in the world. It’s open source, anyone can review the code, anyone can contribute to the code, anyone can run the software voluntarily and participate in the network, and anyone can use the network without permission. The entire history of all Bitcoin transactions is visible to anyone in the world too. Those saying bitcoin ponzi lack knowledge what behind the technology.