The idea of manipulation in games is when they add specifically add game elements meant to keep the user in the game, and encourage them never to leave. Sure it

The idea of manipulation in games is when they add specifically add game elements meant to keep the user in the game, and encourage them never to leave. Sure it's all a matter of self-control. Not losing your life-savings at a casino is also about self-control. That doesn't mean that casinos can't do ethically dubious things to take advantage of people without self-control. E.g. The inside of a casino always looks the same, even at night. No windows (being near the entrance is the exception), lots of bright lights. It makes it easier for a gambler to lose track of time.