Obviously they are so popular in Japan because they’re meeting a genuine need because of trying to cram all those people onto one tiny island.
Both the US and Canada have tons more space so there is no genuine need for cramming people that tightly into a small compact space. There’s just no need for them and the majority of people wouldn’t pay any money to be jammed in like sardines.
And if it’s not something the majority of the public would pay money for, it just wouldn’t be financially successful. It mightt perhaps be tried as a novelty item in someplace more crowded like NYC, but even that would be too risky an investment for most business owners to gamble serious money upon with no real clear need.