Albert Barnes on Revelation 18:5

For her sins have reached unto heaven. So in Jer 51:9, speaking of Babylon, it is said, "For her judgment reacheth unto heaven, and is lifted up even to the skies." The meaning is not that the sins of this mystical Babylon were like a mass or pile so high as to reach to heaven, but that it had become so prominent as to attract the attention of God. Compare Gen 4:10, "The voice of thy brother's blood crieth unto me from the ground." See also Gen 18:20.

And God hath remembered, her iniquities. He had seemed to forget them, or not to notice them, but now he acted as if they had come to his recollection. Rev 16:19.

(g) "reached unto heaven" (h) "remembered" Rev 16:19