Ancient Egyptians were capturing Blacks as slaves thousands of years before Muslims appeared.
Muhammed, the prophet of Islam, had at least twenty slaves, many of them Africans.
Twentieth century theologians had thought Rev 18:3 must be allegorical as it was thought that the practice of slavery had already ceased. Now we're discovering that it is still being practiced today. It has never stopped. The bible is right.
By the way, the entire nation of Israel used to be slaves of Egypt.