This comes up, especially in relation to questions about free speech. It comes up, in terms of working with compulsion loops some might term addictive. It comes, in terms of whether or not game designers worry about what they do.
The most common answer is “no,” likely because it’s an uncomfortable question people would rather not think about, or one that positions games as somehow an implicitly risky medium and vulnerable to censorship, or because of a disclaimer of responsibility embodied in the notion that we’re just providing entertainment and anything past that is the player’s problem. Sometimes there’s an implicit idea that mere entertainment cannot have any effect.
So do designers worry?
Yes. I have, personally.