According to the Wall Street Journal, according to data provided by cryptocurrency data analysis company Chainalysis, the Ponzi scheme and other cryptocurrency scams involving bitcoin and other cryptocurrencies received at least $ 4.3 billion from investors in 2019. This is more than the sum of 2017 and 2018 ($ 3 billion). In this regard, "Dr. Doom" Nouriel Roubini commented on Twitter: "Is it only $ 4 billion? It feels like it should be $ 40 billion because the entire junk coin market is a scam. In 2019, cryptocurrency fraud involves more than $ 4 billion "The Ponzi scheme is the latest form of bitcoin scams, and platforms like PlusToken have scammed most of their funds."