Even if you must consider the money making aspect of it which is still not bad, but you must not make it a top priority and perhaps betting can be a bit more certain (not really certain) but somehow not worse than gambling which the outcome is based on randomness and not based on prediction. If you want to make money consistently, get a job or start a business.
If someone takes up gambling to win consistently or to improve their financial situation, then as a result, that person's financial situation will be affected only negatively with a kind of certainty. Those who consider gambling as a means of earning money, their financial future can be very terrible. Gambling cannot be a solution to any problem, or it cannot change the financial situation positively with certainty, what we usually see is that those who are addicted to gambling, most of the time they only face losses through gambling, 99% of addicted gamblers face huge losses through gambling. Therefore, gambling should be seen only as a form of entertainment, you must keep your perspective correct, if you see gambling with the right perspective, it will definitely not harm you.
You're on point but it's not as if everyone who takes gambling as a means of earning a living would always face negativity, why it's advised against is cause the risk is very high some might be lucky on several occasions while the majority would suffer numerous losses so it's best to gamble for fun and enjoy the profits if you win cause with that mindset the gambler would gamble with what they can afford to lose and not go all in with most of their cash cause they want to double it and get richer. Well it's good to gamble responsibly, manage the risk and go in with what you're willing to let go, majority of those who go against that principle are the ones who mostly get addicted cause they lose and try to recover it which causes the harm (Addiction).