I agree it might potentially plagiarize some content. As in academia you cannot make a claim or present someone else's work or ideas as your own without referencing where you got the claim from. ChatGPT makes claims about things without referencing the original author/authors of that content.
However, not everything is considered plagiarism just because I read it somewhere and reproduced it somewhere else. If someone described something in detail on a forum and ChatGPT took that information from across the internet and reproduced it for me. That's not necessarily plagiarism.
My point being, there is an enormous amount of information on the internet that is free from plagiarism.