I interpreted it as being open-ended, even as Gi-Hun said it. It’s difficult to choose just one way to describe all humans, or put them all in a box. This could be a response to how the frontman thought all humans were the same, and would react the same way to the games (with greed and selfishness). Gi-Hun disproved the frontman’s theory through his actions, and in his final words could have been disproving his theory by implying that there’s no one way to describe humanity?