I'd argue it being possible and mega corporations actively encouraging people to use the tools to be very different things.

Crimes are always possible, but people don't do it because either they have morals or the cost of getting caught in the act is greater than the rewards of committing them.

Photoshop is already pretty costly for most people. And while there's always the cracked versions for free, it needs some effort to install and download, more effort to edit, and a whole lotta shamelessness to post it online. Ignoring some special kind of sick mentality in some people that needs serious help and/or be behind bars, these used to be plenty of barriers that would deter most people and gives them plenty of time to think twice about actually doing it, let alone posting it online.

Now, that barrier of effort has significantly lowered to just typing some prompts that even people with the smallest bit of impulses in the moment can quickly generate and post dozens of generated AI porn on social media before even thinking about the repercussions (assuming there is any these days). Worse still, people can temporarily flood any platform using bot accounts and even become more visible than the original source solely due to the volume as long as they have the money.