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Before fatca

Before fatca, did greencard holders ever have 100% privacy from the IRS knowing that they had money in offshore bank accounts? Did banking secrecy ever exist before fatca?
Yes, but ONLY if they NEVER disclosed their US address, phone number, email, or US ties to the bank.
Used an open-source RDP to log into his local computer in zero-tax jurisdiction to read emails or respond, so the banks could see (if they were watching) the IP address of the country he claimed as a residence. Have a local phone number in the zero-tax jurisdiction etc.

Caveat: To the "uninitiated", this may be of value, but IRL, the US prosecutors don't give AF about truth or evidence.