I'm pretty squeamish about nudity when it comes to my own body, but fake nudes would not be pictures of my body, so I don't see what there would be for me to be upset about. It might be different if everyone thought they were real, but if people haven't figured out yet any nudes they encounter of someone they know are probably fake, they will soon.

Here's a thought experiment: imagine a world where there are fake nudes of everyone available all the time Would everyone just be devastated all the time? Would everyone be a target of ridicule over it? Would everyone be getting blackmailed? We're probably going to be in that world very soon, and I predict everyone will just get over it and move on. Sharing fake nudes will reflect badly on the person doing it and no one else, and people who make them for their own enjoyment will do so in secret because they don't want to be seen as a creepy loser.