I just assumed that was from people who aren't technologically literate enough to remove the default signature. It never occurred to me it might be intentional.
At least for now, there remain lots of signals that are clear to those with sufficient exposure; from the piece linked in the Oxide LLM doc that was recently discussed here:
"... to anyone who has seen even a modicum of LLM-generated content (a rapidly expanding demographic!), the LLM tells are impossible to ignore. Bluntly, your intellectual fly is open: lots of people notice — but no one is pointing it out."
Neutral signaling: no footer at all
-1 signaling: sent from my iPhone
-2 signaling: sent from my Samsung AI Family Hub 4-Door Flex Fridge