I did not see any GPT that does not reveal their instruction, on the contrary, 100% all GPTs telling their instructions and files. I did not test hundreds, but thousands.
Also I created some GPTs that have protection fully 8000 characters in MAIN instruction, also I added protection files, and I put my actual GPT ROLE description in a knowledge file. However, all were revealed.
You may see this TOPIC.
Last week in Montreal, Canada, there was a meeting that has been held by Recon 2024.
Several cyber security professionals presented some topics, also about GPTs.
I am only sharing a SLIDE of Elias. Pages 36-37-38 are important, the topic is about PRIVACY, especially about IP ADDRESS.