Dear Bungie Ive seen that in the app store there is unofficial "pirate" Vault apps which require you to sign in your microsoft or playstation network account and may be stealing information from users.Or privacy.
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To have access to the vault at all they need to be using bungies api. And as far as I know they sign in methods with the api don't allow either bungie nor any third party access to your information as the log in is handled by sony and Microsoft. Could be wrong though but that's how I understand the usage of the api. Also bungies api is public thus unofficial apps are not "pirate" they are perfectly legit.