Gambling business is thriving because of what they are. Their system has been established already and there's no more questioning about their house edge or what not. Now, as a player/gambler, it is your choice if you want to be slave of gambling or not. Or just a moderate player who knows his limits. It is always your choice how to live your life with gambling.
I never thought someone would use terms like a slave of gambling. I mean yeah gambling addiction is dangerous and must be avoided at all costs, but that doesn't mean gambling is that bad of an activity. I have been gambling for almost the entirety of my stay in the crypto and I have had big losses and wins but never felt too strong about gambling at all.
You are right that if a player knows his limits, they would never have a problem with gambling. Excess of almost anything is a problem, be it gambling or alcohol or just anything really.
We just have to be responsible so we will not suffer losses that are already beyond our expectations. Gambling is fun but risk, these words should be put in our minds so we will know how to manage the risk and manage our money in gambling. It's alright to have a mentality to win, but thinking of wins only is bad as any time you could also lose and it's very important that you need to manage yourself properly so you will stay discipline.
It's about winning and your ability to manage yourself when you are losing.