Playing dice is also a kind of trading but with negative edge (core argument). You can argue the same for any casino game with negative EV that some will win and some will lose, but the real question is can you make sustainable income from day trading, answer is NO, the math is not on your side.
You are not getting it right if you are comparing gambling with trading. They are completely different but their risks can be the same for people that do not know how to trade. Some people could have been trading since many months but do not know how to trade. Some people will even would have been trading for years and still be losing. But if you ask am experienced traders if trading is the same as gambling, the trader will tell you know. There is more probability for traders to make money but which is jot true for gamblers.