Generally, cave location datasets are not widely shared. The contents of caves, both physical and biological, tend to be susceptible--nonresistant and nonresilient--to damage from human activity. It's easier to keep the data "low key" rather than the expend effort on widespread education.
Not just that the cave gets damaged, but they tend to attract people who go in and get lost, injured or die due to being unprepared and not having extensive spelunking experience and training.
