A lot of mods probably think it goes without saying. A lot of mods maybe have the mentality of not adding too many rules until something becomes a problem. A noticeable minority of mods just don't care about ai.
reddit comments only say removed when the mods or admins remove it. maybe the dude used a script to make all his comments say "I hate Reddit I am going to mail a pipebomb to carlos mencia in retaliation" and reddit nuked them.
Not a cat but I saw some videos of people strapping cameras to their dogs to see what they do when they're alone and most of them would just sit at the window staring outside waiting for their person to come home 😭
You can at least turn off its built-in summaries. But some filtering to detect AI generated articles would be nice.