They're making pornography of women who are not consenting to it when that is an extremely invasive thing to do that has massive social consequences for women and girls. This could (and almost certainly will) be used on kids too right, this can literally be a tool for the production of child pornography.
Even with regards to adults, do you think this will be used exclusively on public figures? Do you think people aren't taking pictures of their classmates, of their co-workers, of women and girls they personally know and having this done to pictures of them? It's fucking disgusting, and horrifying. Have you ever heard of the correlation between revenge porn and suicide? People literally end their lives when pornographic material of them is made and spread without their knowledge and consent. It's terrifyingly invasive and exploitative. It absolutely can and must be illegal to do this.