While the cryptocurrency community is excited about the BlackRock Bitcoin exchange-traded fund (ETF) filing and the planned involvement of other prominent players in traditional finance, such as Fidelity and Deutsche Bank, one observer is skeptical. On Twitter, he notes that these Wall Street giants only became involved after the United States Securities and Exchange Commission (SEC) took legal action against Binance, the world’s largest cryptocurrency exchange, and Coinbase, a popular exchange in the United States and Western Europe.