When the monetary system's neutrality is threatened
You may have noticed that when Whatsapp starts a new chat, it displays a message that “end-to-end encryption” is being used. This means that the content of the messages cannot be read by anyone other than the people in the chat (though some question the extent of this). Facebook, the owner of Whatsapp, knows something about who you were in contact with and when, but not (necessarily) what it was about.