OpenAI has built a text watermarking method to detect ChatGPT-written content — company has mulled its release over the past year
www.tomshardware.com
OpenAI just needs to press a button and it will have a ChatGPT detector ready and available.

Am I missing something? The article seems to suggest it works via hidden text characters. Has OpenAI never heard of pasting text into a utf8 notepad before?