Wait, you're suggesting that there should be an option such as 'Remind me what my passphrase is'?
If so, then it's absolutely impossible from the technological point of view - it's not anyone bad will, it's cryptography (pure maths actually). These passphrases aren't actually stored anywhere - they are used to encrypt your data before sending them to Sync servers, and Sync itself has no idea what that passphrase could be.
Think of a safe unlocked by a numbers combination - there's no way to know what that combination is just from standing before the safe, unless you completely break it and see what is inside - and this, in case of modern digital encryption, would take a few dozen centuries at least.
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