Actually GPT-3 detectors can be built https://www.technologyreview.com/2019/03/12/136668/an-ai-for-generating-fake-news-could-also-help-detect-it/ https://www.t

Actually GPT-3 detectors can be built https://www.technologyreview.com/2019/03/12/136668/an-ai-for-generating-fake-news-could-also-help-detect-it/ https://www.technologyreview.com/2019/03/12/136668/an-ai-for... But it'll detect human written one too. So expect many false positives.