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OpenAI transcribed over a million hours of YouTube videos to train GPT-4
(www.theverge.com)
This is a most excellent place for technology news and articles.
https://blog.gdeltproject.org/do-llms-truly-create-or-merely-arrange-just-how-much-of-an-llms-writing-is-original/
So plagiarism...
It only plagiarises you if you write something similar to lots of other people.
Write something original and, even if it is in their training dataset, LLMs are highly unlikely to reproduce it.