What people call AI today is in fact not AI. It is a model that has been trained on input data, and generates prompted output based on that input. In other words:

They are automated plagiarism machines.

That's literally how this "AI" (autoregressive language model) works. The logic is essentially: A little plagiarism is plagiarism, a lot of plagiarism is original works. So if it is detected, then they need to increase their level of plagiarism until it isn't.