MercadoLibre has long been seen as the Amazon of Latin America -- but it's increasingly clear that its story is more complex.When investors think about MercadoLibre (MELI -0.73%), the story has always sounded straightforward: a dominant e-commerce and fintech platform with enormous growth potential in Latin America. The company has been called the "Amazon" of the region, and for years, that comparison worked.But the latest results suggest a more nuanced reality. Growth is still strong, yet profitability is ...