This depends on the purpose and the way you do it. Trading Bitcoin means trading currency, which includes gambling, but also strategy and skill. If you have a balanced portfolio of multiple currencies and hedge the risks - you diminish the gambling element and it becomes more of a solid investment, but it's not just Bitcoin at that point. Trading only one currency is more like gambling as you maximize profits, but it is much more volatile than a balanced portfolio and so there is a greater gambling element, not really suitable for financing your lifestyle or long-term savings.