Which people actively refuse to use because of the association with AI work.

Which is more likely, let's Occam's Razor this. That the AI agents are teaching every individual to "write better" or that the AI agents are crapping out the articles with the emdashes.

Some of us resent the assumption that we're AI because we know how to use the language, and use them more often.

What if, in a terrifying scenario, someone adds "don't use emdashes" to their prompt...

Your cast iron detection mechanism will be gone!