On the one hand, this is egregious and should not happen. People should not be stalked and lied to, and communities should not be manipulated at this scale.
On the other hand, it certainly already happens as it is incredibly easy for any group to use LLMs and do this. So the process and effectiveness should be studied and reported to the public... There might be a better way to do it though?
I wonder if other groups are using AI to post on Reddit too?
I wouldn't want to be a guinea pig for that purpose.
(Seems less likely than on reddit... TBQH)
And people already do paste comments from AI, it's becoming more and more common. At least they have the courtesy of pointing it out but I expect that will stop before the AI comments do.