So apparently, some teams will lose or not attempt to win but maybe tie, IF the ranking will give them a better chance in the end of the end of round robin. So not sure if this is true in this case but there was another.
For example these teams are not linked.
If Team Brazil Plays Uruguay but by letting Team Uruguay win they wont have to play Germany later, but play Mexico, they woukd let USA win because Brazil advances anyway, but then Doesnt have to face a beastly team lik Germany later.
They do this because in the elimination round they can easily beat the worse team. But this only peers its head very rarely, and its not right, but its a business.