system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's so great about a Swiss bank account?
gpt
The main selling point is banking secrecy.  
The Swiss Banking Act of 1934 made it practically impossible for anyone you didn't authorize to get your banking information. Including random people, foreign governments, tax collectors and Swiss authorities.  
So you could stash as much money as you wanted and nobody would be able to ask questions.  
That being said this secrecy has been eroded in recent years, Singapore seems to be the place to store ill gotten gains now.