May be a case of moving goalposts, but I'm happy to bet that the speed of movement will slow down to a halt over time.
The person in the end could also just inspect element to change the output, or photoshop the screenshot.
You should only care about it being as high quality as possible for honest customers. And against bad actors you must just be certain that it won't be easy to spam those requests because it can be expensive.
(Humans can be badgered into agreeing to discounts and making promises too, but that's why they usually have scripts and more senior humans in the loop)
You probably don't want chatbots leaking their guidelines for how to respond, Sydney style, either (although the answer to that is probably less about protecting from leaking the rest of the prompt and more about not customizing bot behaviour with the prompt)
> You probably don't want chatbots leaking their guidelines for how to respond
It depends. I think it wouldn't be difficult to create a transparent and helpful prompt that would be completely fine even if it was leaked.