When you use chatgpt, is it your ideas, your words, your research?
Knowing how to google something foes not absolve you from plagiarism and neither does providing a nice prompt.
For example, someone may construct an argument using a GPT model that animals evolve traits by requiring the need for that trait to exist, i.e., if a crab needs really big claws to eat, the next generations will have big claws. But this is not how evolution works, and we know that from lots of prior research. This is an easy example to both understand and construct a counterpoint against. Without GPT, this person would have needed to look up resources to make their argument, and they would have cited Lamarckism, and if they had we would immediately know where they're getting their idea and fend against it. Simply put, GPT models make it easier to bullshit, and do it tremendously and efficiently.
I don't care if an AI writes something, but if a human uses AI as a co-author, attribution is required and necessary. You should just highlight whatever portion of your writing is you vs. the AI because effectively we are dealing with two separate entities at that point. You are not your AI, and when we will talk in person or offline, it will be painfully obvious.