I read the chapter and it mentions that it is a Prophecy against the city of Tyre. My understanding is that Tyre was something like a modern day New York City, a sort of financial capital. It had a famous port where a lot of trade was conducted. It seems the people of Tyre worshipped and glorified money and gave themselves up to fornication, whoredom and lustful pleasures.Another one of those "Wait...what?" passages, this one from Isaiah, chapter 23 (KJV):
16 Take an harp, go about the city, thou harlot that hast been forgotten; make sweet melody, sing many songs, that thou mayest be remembered.
17 And it shall come to pass after the end of seventy years, that the Lord will visit Tyre, and she shall turn to her hire, and shall commit fornication with all the kingdoms of the world upon the face of the earth.
18 And her merchandise and her hire shall be holiness to the Lord: it shall not be treasured nor laid up; for her merchandise shall be for them that dwell before the Lord, to eat sufficiently, and for durable clothing.
Verse 16 seems to say the people of the city have prostituted themselves to the evils of greed and lust. And that Tyre should repent and publicly proclaim praises to God through song and melody.
Verse 17 seems to mention that after a period of 70 years (the lifetime of a king), they will lose any remaining traces of national identity as they are prostituted to one kingdom after another, foreign influences and cultures will rule over them.
Verse 18 seems to say all her spoils and riches shall be given to the righteous people who follow the Lord and who will use these resources for food and basic necessities.
So in a way we are given the picture of rich famous city filled with Greed and Pride. A city that flamboyantly sins in the face of God and his righteous people. A city that believes it is above all, above the laws of God. A city that believes it is a god. This city then faces the Judgement of God and his just punishment. Its wealth and lustful pusuits will corrupt it further so much that it will be abused and used by all the neighbouring cities it looked down upon. Its plunder and wealth will be stripped from it and given to the righteous.
This is in line with His Word that says, He humbles the proud, and He lifts up the humble.