As governments slowly shackle the crypto industry with regulations and obligations, Portugal is increasingly isolated in Europe — a place with few rules that investors describe as a crypto paradise. “You don’t need to do anything else because you already have a perfect system, with zero percent tax on bitcoin,” said Didi Taihuttu, a prominent crypto enthusiast who shifted his family to Portugal from the Netherlands. “For bitcoiners, it’s heaven,” he added. Financial authorities across the globe are grappling with fundamental questions about cryptocurrencies. Firstly, are they currencies or a…