This method isn’t new. People tried to avoid fiscal and trade rules for a long time.
But this trend accelerated after the Second World War when many colonies became independent. Because many of the colonies were only transit areas for trade purposes and weren’t used for production or cultivation. So were some of the Caribbean Islands only used for the Atlantic Triangular Trade.
After the colonies became independent stopped their former mother countries their financial and political support. Many of the newly formed countries could choose then between tourism and financial business. Most of them chose both.
Tax havens are particularly attractive because they offer a large field of financial products and banking services, which attracts private persons, companies, and organized crime.