This talking is about the Jews and everyone who does such as that, so the example of someone who spends in the cause of evil, monopoly, injustice and harm is like a wind containing frost strikes the harvest. Why does Allah (swt) mention the harvest instead of the plants? Because He wants to clarify that if you plow, you will get the result, for planting is the result of plowing the land and preparing it for harvesting, these works are done by a person. However, if the wind is so cold, what will happen? Definitely it will destroy the crops. Look at this great example that Allah (swt) has set about the one who spends his money for praising and in a way other than what Allah (swt) commanded.

وَمَا ظَلَمَهُمُ اللّهُ وَلَكِنْ أَنفُسَهُمْ يَظْلِمُونَ And Allah has not wronged them, but they wrong themselves.}: They are the ones who wronged themselves; because Allah (swt) gave them money and children, but they transgressed and violated his commands.