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 freewill, 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 ran by the casino.
I can't deny that there are still pros and cons in certain circles. But it all comes back to our own assessment, I also won't blame people who in the end they get addicted to gambling, because of course there are causes and effects. But again and again I will say that there is no compulsion here.
We can ask gamblers directly, did they come of their own volition or by force.
Yes, casinos will try to get players playing as much as possible, just as food manufacturers keep increasing the sugar content of the food to make us junkies of it. It is thus for everyone to decide if they can really deal with game in a responsible manner or they would need to do something more radical, like stop playing for a while or play socially to make sure they do not loose it.