Does Canada block content from the USA, yet?
Not yet. But Richard Warman tried to get that, too. It was a site run by some nutbar named Bill White.
He lost that battle, fortunately. Not because Canada would have been any poorer without White's content, but because the precedent would have been devastating!
Notice I default to explaining WHY we stand up for free speech because that's what we have to do in Canada. I forget that, to most Americans, it is self-evident.