You can explore this thread: Magic words can reveal all of prompts of the GPTs
But all in all, as I said there, it should not matter that much you you until you:
- Make sure that there is nothing to hurt you if leaked on the inside,
- make sure your GPT is great at doing its job,
- make sure that you get future user’s attention to it.
- And stay ahead by constantly improving and listening to user feedback.
They are and will be breakable, so why bother wasting precious 8,000 characters of the instructions limit