The issue is not whether you play it off as your own, but how much the damages are that you can be sued for.

I think that's one in the same. I'm just not seeing the damages here because the output of the AI doesn't go any further than being AI output without a further human act. Authors are idiots if they claim "well someone could ask ChatGPT to output my entire book and you could read it for free." If you want to go after that type of crime then have ChatGPT report the users asking for it. If your book is accessible via a library I'm not see any difference between you asking ChatGPT to write in someone's style and asking me to write in their style. If you ask ChatGPT for lines verbatim i can recite them too. I don't know what legitimate damages they are claiming.

For example, voice actors

I think this is a great example but again i feel like the law is not only lacking but would need to outlaw other human acts not currently considered illegal.

If you do impressions you're mimicking the tone, cadence and selection of language someone else does. You arent recording them and playing back the recording, you are using your own voice box to create a sound similar to the celebrity. An AI sound generator isn't playing back a recording either. It's measuring tone, cadence, and language used and creates a new sound similar to the celebrity. The only difference here is that the AI would be more precise than a humans ability to use their voice.