US citizen moves to Canada on a CUSMA visa:

  - 30-50% pay cut

  - points and lottery based immigration system that penalizes them for each year you age after 30

  - frequent unfavorable rule changes

  - fear of being trapped forever on a temporary visa and eventually sent back to the USA, poorer than their peers who stayed stateside.

Canadian citizen moves to us on equivalent CUSMA visa:

  - huge pay raise

  - retire back home wealthier than their peers and still enjoy socialized healthcare.

Canada's immigration system is just structurally tilted toward brain drain. It's all stick and no carrot.