The Oscars is a bunch of old white dudes, voting for things that old white dudes like.
This isn't necessarily intentionally malicious! People vote for what they understand and can relate to.
Which is why a civil rights movie can win! But only if that civil rights movie is made for the white eye:
* There has to be a white savior in it! Non-negotiable.
* The white racist is often forgiven at the end of the movie!
* There is often a "Black people are racist too!" character.