Why is "fornication" used to describe the actions of "Babylon the Great" in Revelation 18?

> For because of the wine of the anger of her fornication all the nations have fallen [victim], and the kings of the earth committed fornication with her, and the traveling merchants of the earth became rich due to the power of her shameless luxury.”—Revelation 18:3 (NWT ) I was wondering if anyone would be able to explain, in what way(s), "Babylon the Great" engaged in "Fornication"?