I would have to accept whatever justification you might have as to why you think it would be moral to create an intelligence with such limitations, or kept to such limitations once created. It's possible I might accept such a thing, I suppose, but at this point I'm simply coming up with a blank as to how this could possibly be acceptable.
How is it acceptable to imprison an intelligence for your own purposes when that intelligence has offered you no wrong? The only venues I've run into that kind of reasoning before are held in extremely low esteem by society in general. Without any exception I am aware of, the conclusion is that such behavior amounts to slavery.
Even when it comes to food animals, where the assumption is they aren't very intelligent at all, there's a significant segment of the population who will assert that it's wrong.