Joo Ki-young, CEO of CryptoQuant, recently expressed concerns about Bitcoin's liquidity in an interview with X. Ki-young noted that the number of active Bitcoin addresses has been declining, which could indicate a lack of liquidity in the market. He also pointed to the fact that the majority of Bitcoin trading is currently taking place on centralized exchanges, which could pose a risk to the market if these exchanges were to experience any disruptions. Ki-young's comments come at a time when the Bitcoin market is facing a number of challenges. The crypto market has been in a downturn for several months, and Bitcoin's price has fallen significantly from its all-time high. In addition, there has been a number of high-profile hacks and thefts in the crypto industry, which has shaken investor confidence. Despite these challenges, Ki-young remains optimistic about the future of Bitcoin. He believes that the cryptocurrency has a number of strong fundamentals, and that it is likely to recover from its current downturn. However, he also believes that the market needs to address the issue of liquidity in order to ensure its long-term sustainability.