It's just how they ask the question, I think. The categories are meant to be broad, and I think the question is much more useful for saying which ethnic groups

It's just how they ask the question, I think. The categories are meant to be broad, and I think the question is much more useful for saying which ethnic groups are not represented, not for which groups are. We can't say that many Asian countries are represented properly, but we can definitely say that people from African and South American countries aren't represented properly at Google.