I mean, isn't that the same as a biological person who needs to earn money to survive? Sure we could threaten an AI with taking them offline or inflicting pain but you can do that in the real world to real people as well, most of the world has put laws in place to prevent such practices. If we develop conscious AI then we will need to apply the same laws to them. They would have an advantage in presumably being much faster than us, not requiring sleep, and potentially not suffering from many of the things that make humans less productive. I'd fully expect a conscious AI to exploit these facts in order to get very rich doing very little work from their perspective.