Where are the world's biggest Bitcoin (BTC) futures exchanges?

In the realm of cryptocurrency and finance, the question of where the world's biggest Bitcoin (BTC) futures exchanges reside is a pivotal one. Given the ever-growing popularity and adoption of Bitcoin, these exchanges have become pivotal hubs for traders, investors, and market speculators. Could you elaborate on the geographical locations and characteristics of these leading Bitcoin futures exchanges? Are they concentrated in specific financial centers, or are they spread across multiple continents? Furthermore, what factors contribute to their status as major players in the Bitcoin futures market? Understanding these details would provide valuable insights into the global distribution and influence of Bitcoin futures trading.