My dad started using chat gpt, I'm a little concerned

My dad started using chat gpt, he's definitely going to be spared when the machines fight against us since he says thank you after each interaction with it so that's not what I'm concerned about.

How actually harmful is chat gpt for privacy? How do they collect data? What do they do with it? Is there a way to use it "safely"?

Would a privacy focused browser combined with something that doesn't show the real ip and a throwaway email …

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