I consider making for a living is where you can always make money in long term, gambling can make money but it's just only for few times and it's impossible if you're only depends on gambling as your main source. Gambling isn't a long term money making because luck isn't always in your side and there's a chance you will get scammed from fraudulent casino. Not to mention your account might get frozen, restricted, or betting limit.
Gambling can't provide a passive income of can't be a stable source of living because of its risks. It can't provide a guarantee of winning all the time so we can't expect to gain a regular income from it. Most people earn through luck and by skills and strategies but it can't be a continuous source of funds. We can do it as a habbit or for entertainment purposes but it is still better to have a stable income aside from it.
Gambling will only defeat those who cannot realize that gambling is entertainment. Every time a person tries to win one game, he can lose his money, and even if he tries again, the result will probably still be the same. But if he can get lucky, he can earn money from gambling but that luck will not come every time he gambles. Therefore, we don't need to think about making money from gambling because it will never be easy, and there is no guarantee of how much money we can get, but all that remains is defeat. But we can use gambling as entertainment fun, and we should treat gambling like that so we don't experience big losses.