Since the thread became on sharing vs not sharing diving knowledge, here is my experience.
I first learned that there is such thing as cave diving when I saw Bogaert's beautiful videos, and right after binge-watching like a dozen of them, I went onto reading and watching anything cave training related. Luckily there was a ton of info on the subject and you could easily learn all the theory from A to Z from your bedroom. It took me several years until I could actually do my cavern and full cave, but in the meantime I found new information on cave training as well as re-read and re-watched things that I saw previously. In effect, by the time I hit the water, I completed all the cave theory numerous times, which was also "taught" by different people with each emphasizing slightly different aspects.
Once it came to the actual training, I already knew what I wanted to ask my instructor (it included basic questions, and some more abstract thoughts on cave diving philosophy; do's and don't etc.). Those discussions with the instructor were the highlight of my course, and they would have never happened had there not been so much information about cave diving publicly available. Also, in all humidity, I think I did pretty well during my course partially because I had a lot of material to read before hand.
So I am for sharing as much info as possible on anything from how to handle a stage, how to do most advanced gas planning, how to do complex navigation, how to plan a ccr cave dive, etc etc etc.
As for people misusing potentially improper information, if in the 21st century you are not capable of filtering through things you read on the Internet, I don't think cave diving is a hobby for you. Plus, we should never stand in the way of Natural Selection.