Aside from the description having the answer, I'm just going to pretend it's an onion article.
With the answer being something like "the US doesn't deserve it" or "people will buy it anyway (and the health crisis is bad enough without new delicious flavors causing regulators to be further on their case), whereas in other countries they need to work a little harder to make sales (they're a bit too healthy)"
"Think of it like ration chocolate, if it tasted too good you might eat it before you need to" one historian added.