On the the Eliminations page, it says that "APEX are the winner of this year's Elimination competition!" I'm not sure if it's grammatically correct for the word "are" to be there. Even if we consider how many of the other teams, have plural words, those likely shouldn't use the word "are" either, since they would be treated as singular proper nouns.
That means that all of them, even the team names including plural nouns, would be "[Team Name] is the winner of this year's Elimination competition!."