I have never used a LLM to write any of my comments on the internet, neither here nor in any social network I have an account. And about the bullet points, in places that accept MarkDown similar syntax I tend to use bullet points because it's a feature that helps lay out the ideas in a good formatting for the reader when there's enumerations, lists, or similar things involved.

But yeah, you will never find comments of mine in, lets say, Instagram, with bullet points, because the editor of the app there sucks, you would have to type your comment in a external app which creates the bullet points characters already in a newline (you cannot even normally break lines in Instagram comments lol, it's really unsanitary haha), and I ain't gonna do that.