FWIW, I was using em-dash before it was actively the opposite of cool.

It's not just that, this construction:

> This isn't X, this is Y

is a huge ChatGPT signal.

	▲	dspillett 2 days ago \| parent \| next [-]
		But surely it is only a ChatGPT signal because it was a strong signal in the training data. You need more than one strong signal with that sort of potential for false positives to make a reasonably accurate identification.
	▲	ben_w 2 days ago \| parent \| prev \| next [-]
		If it is, it's one I've neither heard others mention before nor seen often enough myself to consider it a tell (but for the latter, I do use ChatGPT's customisation options).
	▲	edflsafoiewq a day ago \| parent \| prev [-]
		I love how completely prosaic phrases are now "ChatGPT signals".