Why did Qiniang Mountain close the mountain?

Semi-developed countries. I inquired about the scenic spots in Qiniang Mountain, and I know that the scenic spots are in a semi-developed state and relatively steep, so the mountain will be closed at four o'clock every day. Qiniang Mountain is located in Xinda Village, Nan 'ao Town, Dapeng New District, Shenzhen City, Guangdong Province. It is the main peak of the south island of Dapeng Peninsula, with an altitude of 869 meters and an area of 200,000 square meters. It is only open during the day and closed at night and when it rains.