Why is Tianmanwu Natural Hot Spring Hotel abandoned?

Due to the decline of island tourism and the exhaustion of hot springs. It used to be a hotel providing hot springs in Hachiba Island, Japan. Due to the decline of island tourism and the exhaustion of hot springs, hotels and other surrounding facilities have closed down one after another. It is said that in the process of building the hotel, the remains of the rope age were excavated twice, and the hotel is famous for this strange experience. Although the remains still exist, they have been reburied because they are located in the closed hotel land, so we can't see the unearthed sites.