I have witnessed AOW students being lead around the back of Blue Grotto, and that nonsense happens everyday without being reported.
I did that on my first dive out of OW certification, lol! Not recommended as I did feel a little panicky, but it's not like you can get lost in there if you stay on that rope.
All I know is that if I ever do cave diving, it will be as conservative as possible. I'm far too afraid of drowning to take any big risks. Dying in a cave is NOT the way I want to go. I think when these fully certified cave divers get killed, it's probably due to complacency. You see the same thing in the shooting sports. Not that uncommon to see someone with decades of experience shoot themselves by accident. Once you get comfortable, you're set up for disaster.