Can ordinary people in Shang Dynasty use Oracle Bone Inscriptions for divination? Is divination the privilege of Shang king?

Oracle Bone Inscriptions is not used for divination, it is the font of Shang Dynasty. Divination found in Oracle Bone Inscriptions is a prediction or record of events such as sacrifice and war. Ancient documents such as Shan Hai Jing in Shang Dynasty were basically recorded in words, and the words at that time were very mature.

It has a history of thousands of years from the creation of characters in Cangjie to the Shang Dynasty. But in the past, there was no good writing medium for writing and preservation, and the middle and lower reaches of the Yellow River often flooded. In fact, at that time, the surface height of the plain was several meters to more than ten meters below the surface, so there was little information left, and there was no archaeological discovery, so that foreign historians once denied that China had Xia and Shang Dynasties, but Oracle Bone Inscriptions's discovery was an exception.

Secondly, you ask whether divination is the privilege of Shang king (it should be "emperor" rather than "king"). This is hard to affirm or deny. There are Lian Yi Shan in Xia Dynasty, Gui Zang Yi in Shang Dynasty and Zhouyi in Zhou Dynasty. I have never heard of the saying that the emperor monopolized divination, but Qin Shihuang burned books, but allowed the Book of Changes to circulate in the world, at least indicating that divination was in Qin. Ordinary people should be able to predict the production of agriculture and animal husbandry, weddings and funerals, weddings and funerals, weather, diseases, migration and so on, but these can only be done by people with considerable cultural level and social status.