Sorry, but you seem confused.
The World Cup IS an international tournament for countries, I think you are getting it confused with the major club soccer championships, like the European Champions League.
I don’t feel confused at all. I know it’s a tournament for countries. But it looks like the countries have players from all nations on their teams and strive to get the best players so it’s really not a national team. That’s the source of my non-interest. If all the players on the Belgium team were Belgium , etc. for the other countries, I would be more interested.