The reason why the Qing Dynasty banned Changbai Mountain for so long is that Changbai Mountain is the Long Mai of the Qing Dynasty and a treasure trove of geomantic omen. It is said that the Qing emperor Nurhachi once took his father's ashes everywhere to find a resting place, and finally chose Changbai Mountain, a place where dragons and tigers leap. So we buried our ancestors here. Later, Huang Taiji changed his country name to the Qing Dynasty, and claimed that the emperor made Beijing his capital, which opened the rule of the Qing Dynasty for nearly 300 years. Therefore, in the later emperors, it was believed that Changbai Mountain could bring Aisingiorro Temple a scene of great harmony in the world, and it was a treasure trove of geomantic omen that could be preserved. So it was protected by the Qing dynasty and was named the god of Changbai Mountain by Kangxi.
The reason why the Qing dynasty banned Changbai Mountain for so long was actually for economic benefits. It is said that Changbai Mountain produces a large amount of ginseng every year, which can reach more than 100 thousand kilograms. At that time, 1 kg ginseng was worth about 25 taels of silver, so it earned 3 million taels of silver a year, so it actually controlled economic resources to protect Changbai Mountain.
These are two reasons why I think Changbai Mountain was banned in Qing Dynasty. If you have any better suggestions, please write them in the comments below.