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You need to manually the content for plagiarism using search engines. For AI, you need to also manually check it to look for evident clues (It takes going through hundreds of posts like this to be able to recognise these patterns). Other clues are for example the suspicious frequency of posting by the abuser, like churning out multiple posts per day on a few accounts which is impossible to do by a single person without the help of AI or without copying content from somewhere. Then after you spot these patterns, you can double-check them with the Chat GPT AI detector.

Thank you. I'll follow that advice.