OpenAI could watermark the text ChatGPT generates, but hasn't

[GagHalfrunt]

@Shuck

People were frequently using “ignore previous instructions and do X” to unmask chatgpt text in a lot of contexts, from teachers using it to sabotage “AI” plagiarism to unmasking “AI”-driven live chats by fraudsters - OpenAI disabled it.

How did teachers use it?