I instinctively type alt + 0151 (Windows) or option + shift + - (Mac). I don’t use it everywhere (e.g., code comments), but I often employ it in my writing—a habit I developed after years of roleplaying in online games with native English speakers.
An "advanced, trusted GPT-4, ChatGPT and AI Detector tool" flagged the text above as 100% "AI GPT". If I swap the em-dash for a hyphen, it drops to 48%.
The em-dash is a stylistic choice that's been around since the 1830s–used to create a break in a sentence.
I don’t know why this particular style of writing is flagged as AI-generated—as if real humans can’t pause for dramatic effect. We're left second-guessing our own voice and swapping out em-dashes for clunky commas—just to prove we're real.
If that makes me sound like a bot—so be it.