How did money disappear from FTX?

I'm really puzzled. How did the money disappear from FTX? Was it a result of internal fraud, or was it due to some external hacking attack? Were there any red flags that were missed, or was the whole thing a well-orchestrated scheme? What kind of security measures were taken by FTX to prevent such a massive loss? And what does this mean for the future of cryptocurrency exchanges? I'm sure many people are worried about the safety of their investments. Could you please provide some clarity on this matter?