All three of the categories of businesses you mentioned can be run ethically in theory. In practice that is rare: they are often run in a way that shamelessly preys on vulnerable people, and these tactics should be more closely investigated by regulators - in fact they are regulated, and AI chatbots should be as well. Sam Altman is certainly much much more ethical than most pornography executives (e.g. OnlyFans is complicit in widespread sex trafficking), but I don't think he's any better than freemium game developers.
This question seems like a bad-faith rhetorical trap, sort of like the false libertarian dilemmas elsewhere in the thread. I believe the real issue is that people want a culture where lucrative business opportunities aren't subject to ethical considerations, even by outside observers.