Bruno Díaz (Batman) probably does not use virtual currency for several reasons. First, he values privacy, and although cryptocurrencies offer some anonymity, transactions are traceable. Additionally, as a millionaire, he has access to safer and more controlled financial methods. He might also consider them a security threat, as a digital breach could compromise his identity. As a responsible businessman, he may avoid technologies that are not yet fully regulated and are associated with illegal activities. Finally, his practical and conservative approach would lead him to trust his own financial systems more than decentralized solutions like cryptocurrencies.