I don't understand this irrational fear. This can be done today, just need some minutes instead of some seconds to create a good Photoshop.
Also, seriously this is the thing you fear? fake porn? there are much worse thing you can do with this tech, like phising, falsifications, etc. Not mentioning leaving millions of graphic designers out of job.
Photoshop is a skill, not very widespread as we assume.
Typing something is literally at everyone's fingertips.
I agree that it's much easier to do low effort stuff to wind friends up, but universal access and low effort don't make it more likely to be impactful and believable.
If someone really wants to hurt you, not having AI isn't going to stop them.
I'm being polite. Things will be so much worse.
Someone will make child pornography using your child's face as the input. Someone is going to take private videos of politicians and then edit them to have them say incriminating things. Someone is going to short the stock of a large company, then release a faked video of the CEO being shot, and profit from the immediate stock plunge.
And this is just what my mind can come up with. Imagine what 4chan will invent.