Bitcoin Trading isn't Gambling but Buying Bitcoin is gambling, in the sense that its an investment that could price crash at any time.
It is like gambling, but not as risky. When you gamble and lose all your money it is impossible to receive any kind of refund, it could happen while trading, though, but the probability is lower, you can track the price changes at least. Also trading isn't addictive, so you don't feel like you have to put all in because of a chance to gain a lot more.