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.
how is the risk the same?
the risk of gambling and risk of trading is not the same at all. in gambling you are risking all your money (all that you have placed on the bet) and there is no way of knowing about the result.
this is while you are not risking "all" your money in trading, you can always sell at a loss and only lose a small portion of the investment not all of it unlike gambling. also you can predict the price to some extent.