They stole all that wealth through usury to get it.

Their end is destruction, their god is their belly, and they glory in their shame, with minds set on earthly things. But our citizenship is in heaven, and from it we await a Savior, the Lord Jesus Christ, who will transform our lowly body to be like his glorious body, by the power that enables him even to subject all things to himself. - Philippians 3:19-21

Fallen, fallen is Babylon the great! She has become a dwelling place of demons and a prison of every unclean spirit, and a prison of every unclean and hateful bird. For all the nations have fallen because of the wine of the passion of her sexual immorality, and the kings of the earth have committed acts of sexual immorality with her, and the merchants of the earth have become rich from the excessive wealth of her luxury.

I heard another voice from heaven, saying, “Come out of her, my people, so that you will not participate in her sins and receive any of her plagues; for her sins have piled up as high as heaven, and God has remembered her offenses. - Revelation 18:2-5

Babylon Is Fallen - Second Ireland Sacred Harp Convention