If the eight-character fortune-telling is really so powerful, why does the country still make it superstitious and why not use it abroad?

It is not allowed to tell fortune on time, based on the theory that the Book of Changes is metaphysics and cannot be scientifically verified and explained. This is similar to the truth of Chinese medicine. As for why the country is regarded as a superstition, it does not mean that it is really a feudal superstition. It just doesn't want people to rely on fortune telling, such as gambling. As I said before, punctuality is not allowed, so those fortune tellers dare not gamble to win money, because it is an adventure!