Typos and EM-dashes are not just obvious. They are avoidable. Here's the kicker: Even if you remove those, other AI smells don't just exist. They are obvious.
Yeah a trend that I've noticed in online comments is people taking LLM generated text and just removing punctuation and making it all lowercase. It's like dude, it's still so obvious xD
People who say such things constantly make incorrect claims about AI authorship.
Maybe, though maybe we're only noticing it when it's obvious? Sort of a survivorship bias thing?
Who knows how much of the comments on any website are written by humans now; yeah there are plenty of tells so it can be obvious, but that might only be for the exceptionally bad posts.