In the case of a pornographic video there is no issue if it's clear from the context or content that it isn't actually me doing what's in the video
When you talk to ChatGPT, I don't actually think Scarlett Johansson is speaking to me
If I make a fake phone call recording with her synethetic voice and claim it's real and it somehow hurts her then that's an issue - but that's a different legal matter entirely