Ah yes, the good old sprinkling of magic cryptography over your product. I suppose it's all fine then.

Encryption is reversible, the question is who has access to the keys and what data does it unlock.

Also, it seems odd that this is never mentioned in your privacy policy (ctrl+f "crypt" to match decryption/encryption/cryptography, but no hits). You'd think if this is a core feature to maintain security and/or privacy and distinguish yourself from the competition, it would be in there...