A clear sign for me is always the use of long em dashes ⸺

OGWhales an hour ago | parent | next [-]

I've been using em dashes for forever, they are the best punctuation. Sad world where using them means you're an AI

nicman23 2 hours ago | parent | prev [-]

what the ... that is one char

Let me introduce you to three-em dashes: ⸻

It's not just long⸻it's extremely long!

	▲	nixon_why69 29 minutes ago \| parent [-]
		It was bad enough when the AIs were only competing on thinking, now I gotta worry about length?

depr an hour ago | parent | prev [-]

And your ellipsis could also be one! …