the iOS VPN app can be used to sign in to my account with a QR code. This feature is protected by iPhone Passcode (which is good), but it is not possible to lock down the VPN app itself. This means that anyone who knows the iPhone Passcode can log in to my Proton account and gain access to my emails, my drive, and so on. That is clearly not good. Please add the same option to lock the VPN app that other apps (Mail, Pass, etc.) already have.