The meaning of "mini" changes depending on context
Over in America, the people are fatter and the roads are crowded with lorries, so it's much harder to make the case for kei-cars and subcompacts. I remember in elementary school one of my instructors had a 1972 Mini Cooper, and he used to complain that he couldn't upgrade to a Rover Mini because of stupid import laws. One of the major concerns with importing Minis was their relative size compared to American vehicles, and the similarity to motorcycle engines made it difficult to classify them as "cars".
The larger Mini developed by BMW was the saving grace for the Mini brand over in America. Finally the fat asses had a "small" car that they could claim as a status symbol. They also featured the car in the first Austin Powers movie, because cultural appropriation is a sure fire way to get Americans to spend money.