It would be an incredible advantage. Salaries are already lower when compared with the other major North American tech centers. Add the exchange rate into the mix and Amazon's money will go a long way.

Not only salaries and the exchange rate, but total compensation (of which healthcare is a big chunk) is lower for Canadian employees because healthcare is funded by the Canadian federal and provincial governments[1].

[1] https://www.canada.ca/en/health-canada/services/health-care-...