The em-dash thing was particularly stupid because LLMs did use it more than most people would BUT Google Docs would auto-correct a double hyphen between a word with no spaces into an em-dash. I know because I this a lot for years.

The AI cheating detectors are just more rent-seeking bullshit too. The dirty little secret here is that at college in particular, professors don't want to teach. It's an inconvenience that comes with getting tenure. So they want to be able to automatically mark work and/or push it onto TAs.

The solution here is that college needs to look a lot more like PhD dissertation defenses. That is it's in person and oral. But people don't want to do that because it's work and colleges are in the business of selling degrees as cheaply as possible at the highest price possible.

So AI is kind of the kryptonite for the college industrial complex and I'm honestly not upset about that.