It's educated gambling. You might be able to get an edge by trading. The thing about gambling is the house has the edge. In trading you just have to have an edge over whoever will try and buy your coins. So this could be information somebody doesn't have, research and chart reading knowledge you have etc.
Exactly risk in both are same but playing gambling and trading is different for trading you must know about market and gambling you must know about games. So Trading is different and gambling is different.