Interesting side thought, dunno if it would give any real indication, but I assume the difference between pasting a bunch of text vs typing each character would seem like a potential indicator (for now) whether someone might have used AI to respond.

If my comment is more than a few sentences, I’ll often type it up in my Notes app and paste it in. It means I don’t lose it if there’s some kind of technical issue, and I don’t run the risk of accidentally fat-fingering the Submit or Reload buttons. I do it with text messages too.