The AI needs to be able to market products, close deals, design and build products, write contracts, review government regulations, lobby Senators to write favorable laws, out-compete the competition, acquire power and resources, and survive the hostile attention of competitors.
If your argument is based on the that someone will build that AI, then you need to imagine how hard it is to shut down a Fortune 500 corporation. The same AI that knows how to win billions of dollars in revenue, how to "bribe" Senators in semi-legal ways, and how to crush rival companies is going be at least as difficult to "shut down" as someone like Elon Musk.
Try to turn it off? It will call up a minority shareholder, and get you slapped with a lawsuit for breach of fiduciary duty. It will convince someone in government that the company is a vital strategic asset.
Once you assume that an AI can run a giant multinational corporation without needing humans, then you have to start treating that AI like any other principal-agent problem with regular humans.