How can something structured as a Pyramid-Ponzi scheme be considered a legitimate new industry? I've yet to see anyone address - while referencing the Pyramid-Ponzi structures of the most popular crypto-assets - and give reason as to why this is okay (when traditional Ponzi schemes are not legal, and for good reason).
Here you go. This chart breaks down the differences between Pyramid schemes, Ponzi schemes, and open public cryptocurrencies such as Bitcoin. By "open public" I mean that there is no central authority or organization. Bitcoin is a decentralized open source project run by community participation (anyone can run a node or miner, and millions of people do).