Oh, sure. My only intention was to show that limiting the AI's power to mere communication doesn't imply safety. There may be thousands of specific ways how it could go wrong. For instance:

The Oracle answers that human utility is maximised by wireheading everybody to become a happiness automaton, and that it is a moral duty to do that to others even against their will. Most people believe the Oracle (because its previous answers always proved true and useful, and moreover it makes a really neat PowerPoint presentations of its arguments) and wireheading becomes compulsory. After the minority of dissidents are defeated, all mankind turns into happiness automata and happily dies out a while later.