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 Bonus question: can anyone comment on the legality of wiping your device if you find yourself in the hot seat?  Pretty sure there's a jurisdiction somewhere that would charge you with destruction of evidence... even without any evidence  
 It'd be better if the OS just got silently replaced a decoy image. 
 It's easy, just don't use GrapheneOs😄 I will always use it. 
 Obviously we can't speak on what potential bad guys (criminals or abusive states) would do. Laws are different elsewhere, but some would likely choose whatever would happen to them over what would happen if they surrendered. If a threat threatens to kill you, how can you be sure they won't just kill you if you complied anyway?

Sadly a duress PIN isn't designed to make you unaccountable. An erased device will always look obvious, and how they treat it really depends on who is trying to take it away.

You can best describe it as a trigger for erasing data to prevent an unauthorized party (in your proximity) from having potential access. It's great for protecting data you do not want anybody but yourself knowing. A whistleblower preparing to leak something confidential could come to mind.

It's more about protecting your data than yourself.