What's the difference between fortune telling and Zhouyi?

The Book of Changes is a very philosophical book in ancient China. Fortune-telling is at best a derivative of Yi. In addition, because some Jianghu artists who are not proficient in learning make things up, many of them are deceptive. Moreover, in order to make the guests happy, fortune tellers nowadays will report good news instead of bad news, which exaggerates the good part and leads to absurdity and false superstition.