So 999 people that are just making an image need to be DRM'ed so that you might catch the 1 person making "realistic but deceptive" images... like this is some kind of special case of ... internet images.
There is no case that any of its particularly harmful outside of things like CSAM which is illegal.
Only the investigative or journalistically inclined will make use of this, and those people already fact check.
Where’s the en mass gain?
Unfortunately, simple statistics mean that you will get a lot more people than just "1" creating disinformation with AI assistance.