Why do you assume its aiming solely for the US? Just because a US company is involved? There's nothing that states an American company can't develop a TV show primarily for an international market. They do it all the time for films. The last two Pirates of the Carribbean films were made for the international box office where it was still considered a hit franchise. It flopping in America made absolutely no difference to anyone at Disney.
Popular manga + Netflix exclusivity?
I also saw in one article that they counted any streams where someone watched at least 2 minutes so even if a bunch of people decided to check out the 1st episode and then dropped it, they counted it.
"One Piece looks weird!" is clownery of the highest caliber and makes you sound as stupid as people who don't watch anime because "the eyes are too big" at least be creative and blame it on it being too long. At least then you don't sound ignorant.