Pretty sure the angst is about the AGI killing everyone. What's the connection between not killing people and enslavement? I don't kill people, yet I don't consider myself enslaved. The entire point of worrying about this at all is that a sufficiently smart AI is going to be free to do whatever it wants, so we had better design it so it wants a future where people are still around. Like, the idea is: enslavement, besides being hugely immoral, obviously isn't going to work on this thing, so we'd better figure out how to make it intrinsically good!