I have several friends who streamed from outside the US, and at one point, they geo-fenced because of the difference in royalty rate. That led me to believe that the streamer is liable for the rate in which the listening takes place, regardless of origination. I'll check with them again on this.
That would likely be the case in developed nations where there is a strong rule of law. In lesser developed nations, particularly those with no reciprocity agreements, there may be little enforcement and no fees set by legislation.