The IRS has not followed up re any FATCA information sent to it
On a per capita basis, the IRS has about 1/5 the number of CRA employees.
When asked about how much FATCA information had been transmitted to the IRS and what its response was, CRA stated:
As of April 1, 2019, the CRA had sent over 700,000 records to the … IRS … under the [FATCA program] for the 2017 tax year. Apart from standard automated notifications to identify file and record level errors, no further information has been requested by the U.S. with respect to this data.
Neal Armstrong. Summary of 7 June 2019 STEP Roundtable Q. 17, 2019-0798711C6 under s. 266(1).