You don’t need to know anything about AI to know that. Just do some basic critical thinking:

• What does “world’s money system” mean? A stock exchange? Software that runs some process at the Federal Reserve of a specific country? Credit car company databases? What? It isn’t centralized.
• The ability to “turn it off” means what exactly? Do you think there’s some switch to disable all credit card transactions for a whole company? Or just break their software?

Even if AI is perfected, nobody in their right mind would give direct control of these things to an AI. There isn’t any reason to. An AI would basically just be another person, but super smart. It could be useful for a lot of things, but their decisions would need to be vetted by humans, and there isn’t anything like a “shut it off” switch that exists as it is.