US FATCA (2010)
The US Foreign Account Tax Compliance Act required foreign financial institutions to report US account holders to the Internal Revenue Service. It forced banks worldwide to share account data or face penalties.
Foreign banks signed agreements with the IRS and began reporting US account holders.
FATCA set a template for automatic exchange of financial information, later adopted by the OECD's Common Reporting Standard.
France's wallet rule applies the same logic to crypto: instead of relying on intermediaries to report, it makes the holder declare directly.
