Indeed.

All the blather about Canadian "trade surplus" is actually oil.

US companies owning that infra sell that oil under market price, to their US corp divisions. The CEO, upper execs are usually American, and so their large salaries, and all corporate profits all flow to the US parent corp.

Canada of course sees some taxes per barrel of oil, and local employment, but when you remove all this, Canada has a massive trade deficit with the US

Of course for this US calls Canada trade unfair.

It's all smoke and mirrors.