I don't believe we know exactly how many times MCAS has activated, worldwide, ever? We only know for certain that MCAS triggered three times.
US airlines account for 18% of worldwide MAX deliveries. That means there were four times as many MAX's being flown by non-US airlines as by US companies. Assuming similar flying hours per a/c, that suggests to me that it was four times as likely a non-US a/c would have an MCAS event.
To me, it looks like the lack of US MCAS crashes is less about pilot training, and more about arithmetic.