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OpenAI has built a text watermarking method to detect chatgpt written content
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
More info if you're seriously considering it. https://codoraven.com/blog/ai/stable-diffusion-the-invisible-watermark-in-generated-images/
I don't actually know if any model creators check for the watermark or not.