Mainland tourists disappearing into Taiwan

Here's an eye opening, but perhaps not that surprising, consequence to expanded tourism between China and Taiwan - many mainland visitors go to the island and just... disappear. According to CRI English, roughly ten people have pulled this vanishing act in recent months. Travel agencies are now being pressured to keep better track of their wards by the Cross-Straits Tourism Exchange Association, which said it will deport these missing persons if it finds them, but they will not be charged. In return, agencies have begun doing background checks on clients, holding onto personal documents during the vacation and asking for large deposits (to be refunded after the tour),. Yes, but are those deposits more than the cost of a Snakehead?