We have good ways of monitoring chatbots and they're going to get better. I've seen some interesting research. For example, a chatbot is not really a unified entity that's loyal to itself; with the right incentives, it will leak to claim the reward. [1]

Since chatbots have no right to privacy, they would need to be very intelligent indeed to work around this.

[1] https://alignment.openai.com/confessions/