It gives users complete control over their private keys because it does not store them on its server. Rather, the keys are stored on the user's PC. In addition, each user gets a unique monochrome seed phrase that controls access to the account. This is the second level of security that allows users to have full control over the wallet.
This combination of features protects funds in the wallet of users. However, since the platform is not controlled, it cannot be called fully secure.