Why can't Apple phones be used in rivers and lakes?

The app failed to pass the review of the Apple App Store. The app of the search party Jianghu does not meet the safety standards, so it can't be downloaded and used at present, and it can't be used until it meets the standards. FangJianghu is a mobile office software specially designed for real estate agents. The platform covers real estate declaration, customer display, customer entry, transaction data management and other functions.