I don't know how the numbers break down, but plenty of people that buy credit card numbers are happy to orchestrate a scheme to ship packages to the US and have someone forward them to the scammer. Or steal them off your porch.

It is probably exceptionally rare for a fraud protection algorithm to be in place to inconvenience and spite you. Rather, some ne'er-do-well has cooked up a bafflingly complicated scheme that looks like your legitimate business. Such is the tragedy of operating at scale.