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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The Bungie/Destiny API is an open source that is usable by anyone. Of course, there are risks to using third-party applications, but that's at the expense of the user. Bungie has a terms of service and use which cover this. These apps are, for the most part, entirely legal. They do require, just like Bungie.net and the Companion app, for you to sign in through PSN/XBL since your Destiny account is tied to those.