You don’t always have control over what is published about you online. Comments are only one aspect of this. I’m sure you would not be happy if I widely published your full name, address, birthday, names and ages of family members, occupation, etc. just because I was able to piece it all together from public info.
I wouldn't be happy but if all of that were public information, I don't see how we can expect to regulate the equivalent of web scraping while still allowing human agents to perform the same actions.
You don't see a difference between a person doing something and a machine doing the thing in bulk? I think there's a very meaningful difference there.
But practically, I fear that you're right. That distinction will not be made. That's why the only viable defense against the likes of OpenAI that I could think of was to close my websites to public access. I'm still seeking a way to safely reopen them. I hope I can find one.