Cryptocurrency investors appear unhappy with the decision by Vanguard, a leading asset management firm, to block its clients from accessing the recently approved spot Bitcoin (CRYPTO: BTC) exchange-traded funds (ETFs). This move, following the U.S. SEC green light for these ETFs on January 10, has stirred significant debate and dissatisfaction among crypto enthusiasts and investors. Many in the crypto community have voiced their concerns and disappointment on social media, criticizing Vanguard for its seemingly anti-innovative stance in the financial market. Last Sunday, investor Mike Alfred s…