Like you said, the casinos aren't to blame, whether it be for addiction or whatever, like other businesses out there, the casinos owners are also running their business, and who ever chooses to create an account and gamble on a particular casino did so on his or her own free will, he or she was not forced, and whoever is gambling should be matured enough to know how to control him or herself from getting addicted.
And again, promotion is very legal for every legitimate business out there, the fact casinos run promotion has nothing to do with gamblers getting addicted, addiction is majorly a fruit of lack of self-control, not a fruit of promotion run by the casino.
The fact that casinos are open for business and the gambler has the sole responsibility to guide their gambling behaviour in the long run since it is clear that revenue generation is so at that there is not much emphasis on players' protection both avoiding addiction and losing money.
So at that casinos always aimed at reaching the heart of their players via their various promotions and this is some people have seen it as a ploy to lure gamblers who are trying to avoid excessive gambling.
But then the casino must continue with the business and at that that have to look away from every criticism and leaving the players to decide their gambling habits.
I must, with great respect, challenge the notion that casinos are the lone culprits of gambling addiction. Ultimately, it's the gambler who chooses to play and sets the stakes. Sure, promos and bonuses entice, but self-restraint is up to the individual. Gambling, akin to movies or sports events, offers entertainment. Casinos? Merely profit-seekers, like any business. Policing patrons isn't their gig. The onus lies with folks to own their actions and find help if needed.