I suspect Gresham’s law kicked in years back. Some people have things to say but they’re not interested in the current state of internet comments. Particularly if their topic is esoteric or, horrors, seen as controversial.
A spammer would agree. Trolls most certainly agree. If I was to add the function to comment it would use local storage. [1] not my repo
If I wanted interaction from visitors I would make one of my forums public. They would at least have to register and they would be subject to normal moderation. As a new member only I would see their comments until their rank moves up from Guest, thus weeding out most low effort trolls and grifters.
If I really wanted to hear from random visitors of a blog I would give them a throw-away email address or a form to contact me.
And ai commentary is a waste of electrons.