Nu Holdings (NU 2.22%) is a digital bank that has disrupted the traditional banking sector in Brazil. The region was once known for its limited options and outrageous customer fees, making banking inaccessible to many residents. However, with its innovative approach to banking, Nu has taken a dominant position and counts Berkshire Hathaway among its investors.The consumer finance company is expanding its footprint into other key markets in Latin America, including Mexico and Colombia. However, it's been a r ...