Seems to be very popular in the US, going off this thread.
Europe is very segmented, like usual. It's readily available on both amazon.de and amazon,fr despite ranking fist in overall gaming bestsellers on amazon.fr and a slightly underwhelming 21st on the amazon.de though, so the shipment must have been sizable enough.
While I think that Nintendo has better market penetration in france than it has in germany atm, I think it is worth pointing out that many Nintendo products and releases are up to 15 cheaper than their german counterparts iin france.
ARMS official price for the german version is 59,99 (the digital version used to be a whopping 69,99, but they seem to have reduced it now), while you can get it on amazon.fr for 44,99. So importing really pays off, especially if you order several items to reduce shipping cost per item. I can't be the only one to take advantage of that.