According to market information, the United States Securities and Exchange Commission (SEC) has recently taken further regulatory actions regarding issues with the decentralized exchange Uniswap. The SEC has sent letters to some prominent venture capital funds, including a16z and USV among others. These letters indicate the SEC's continued focus and regulatory intensity in the cryptocurrency market, specifically in the DeFi field. This initiative is aimed at ensuring market transparency and investor protection, and also reflects the concern of regulatory agencies for new technologies and the potential risks and opportunities they may bring.