Gambling stays more risky because you do not have any grab on it you lose or you win, trading is still a bit on the control.
If you think that gambling stays more risky and what do you think about trading? Isn't it risky either? Both of them are risky and it will just depend on the person on how he is good for each of them. Just like me, I can say that sometimes I am good with skill-based gambling but there are times that it is really not doing good with me, vice versa with trading. It really depends on the person.