I don't know. I read the content policy, and it's quite vague. Basically, trying to make CSAM, trying to violate OpenAI safety features, trying to pass off ChatGPT responses as valid financial, legal or medical advice, or things like that.
I once asked chatGPT for a simple Python script to organize files in a directory and received a warning. Still don't know what that was about, but I guess their detection is not perfect.