Paywalled. What specific details did it hand out? Is this some dumb American thing where it leaked his account number and that’s enough to compromise his account, or did it leak his bank credentials?

Bank details are supposed to be given out - that’s how you send/receive money.

All Business Insider articles are free form paywalls when accessed via the Africa subdomain, including this:

https://africa.businessinsider.com/news/my-personal-ai-agent...