Even if they were physically in the US, they would still have had to use Chinese payment systems.I wouldn't call it a fortune. Given Americans' prejudices, the ones most likely shopping on Single's Day would be Asians living in the US and they're only around ten to twelve million in the US population. And then how many of them are shopping on Single's Day? Trump is not thinking that. He either believes the US controls world trade and has that power or he thinks Americans are Single's Day primary customers because that's what Americans in general think that it's the US that only buys things in the world not anyone else.