Why can't Hong Kong hotels open windows?

Hotel windows can't be opened, even if they are opened, they can only be opened at a certain angle, that is, an adult can't get out. There are two main considerations: one is to prevent guests from accidentally falling off the building, and the other is to prevent guests' property from being stolen. Of course, if the guests strongly request to open the window, the hotel will come up with an exemption agreement to let them open the window after the previous life.