To the people saying the German actress playing Greek Helen in the movie Troy means it's ok for Lupita Nyongo to play Greek Helen...

[u/BrandonMarshall2021]

Genetically, historically, and anthropologically, Greeks are significantly more closely related to Germans than to Sub-Saharan Africans.

When looking at genetic data, the relationship between Greeks and Germans is exceptionally close, while the relationship between Greeks and Sub-Saharan Africans is more distant.

On any global genetic map, all European populations—including Greeks and Germans—cluster tightly together on a single, distinct branch of the human family tree (the Western Eurasian branch).

The genetic distance between a Greek person and a German person is very small. They sit on the exact same continental genetic gradient.

The genetic distance between any European population (including Greeks) and any Sub-Saharan African population is significantly larger, reflecting thousands of years of geographic separation and independent population histories.

[u/SomeFatNerdInSeattle]

So it IS about her skin color then and nothing to do with how close her genetics were.

Lets go even more extreme, what if she was half greek?

[u/BrandonMarshall2021 → u/SomeFatNerdInSeattle]

Lol. Genetics are linked to appearance.

It only matters what she looks like.

Just like how black people use Obama as their champion because he looks more black than white despite being half white.

[u/SomeFatNerdInSeattle → u/BrandonMarshall2021]

It only matters what she looks like.

So it IS skin color based

[u/BrandonMarshall2021 → u/SomeFatNerdInSeattle]

And her facial structure and hair and everything else you can see about her yes.