Spanish authorities have arrested Álvaro Romillo Castillo, accused of orchestrating a $300 million crypto pyramid scheme that defrauded over 3,000 investors. Castillo operated under the alias 'Cryptospain' and managed the Madeira Invest Club, which falsely promised 20% annual returns, using new investors' funds to pay existing ones. Investigations have revealed Castillo's involvement in financing a far-right politician's campaign and laundering millions through offshore accounts. This arrest has prompted a wider investigation into the politician's campaign funding and potential breaches of campaign finance laws.