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.