I think you can just as easily flip that on its head.

USA consistently weaponizes its companies through sanctions. If a country wants to be part of the global economy you need to do business with USA banks (eg SWIFT) and tech, and if your country is sanctioned, it cannot. Speaking of tech, the tech companies actively participates in wiretapping and that’s really old news - who knows what they’re doing today.

China is typically careful about throwing its weight around because of its high dependency on exports and limited deployment capability of its army.

In terms of a shooting war with the USA, China has a strategic advantage in being able to shut down Canadian transportation remotely, agreed.

I think recent events have shown, however, that there’s no guarantee that the USA would automatically be on the side of Canada. I’m thinking more it’s more along the lines of how Germany and Austria were “on the same side” in WWII ie Annexation.