~snip~
If anyone says they make a living by gambling, they are definitely lying.
Gambling means luck and it is not possible for a person to be lucky all the time.
Even if it is a game played with knowledge, luck is definitely required.
If you try to do this with sports betting, you still have to be lucky.
In short, I never believe that there is such a person. Sometimes people get lucky and win well, but sometimes they don't get lucky and lose a lot.
To be fair, the quote said "in gambling", not "by gambling", so although I absolutely agree with your point, that is, that most people will never be able to earn a living by gambling, because the odds are against them, the fact is that some people actually do earn a massive amount of money in gambling, that is, the owners of the casinos.
we all know the point of consideration here. generally, there are a lot of people around the gambling sphere who make a fortune out of gambling but never lose. for instance, if you visit my country, you will find a lot of gambling shops that are owned by people who sometimes dont even gamble in the first place, for them, they might be making a living out of the gambling business by just investing their money In setting up the business, but the real gamblers that visit their to gamble can not boldly say that they are making a living from gambling.
the basic thing is that gambling was never meant to be a source of living. it is ideally what we are supposed to do for fun after we are done with our work which is the main source of our livelihood. Once you start looking at gambling as a means of making a living, you automatically fall into that category of people who will gamble every day of their lives because they want to win so they can put food on the table, that state is even worse off than being a gambling addict.