Answer: Bitcoin does not meet the second criterion of a Ponzi scheme because there is no concerted effort to claim that investing in Bitcoin is risk free. While some people may make such claims, they are not part of an organized effort to deceive investors. In fact, there has been a lot of public education and awareness-raising about the risks of investing in cryptocurrencies, including Bitcoin. For example, Arthur Hayes, the CEO of BitMEX, has done some public service announcements about the dangers of investing in cryptocurrencies, such as Bitcoin. He has warned people not to invest money they can't afford to lose and to be aware of the volatile nature of the market. Therefore, Bitcoin does not meet the second criterion of a Ponzi scheme.