It happens occasionally that a DJ will plug their headphones to the mic input in their console and talk to the earpiece to make some announcement in bars/clubs when there is no mic available around. But, yeah, if one could turn the headphone output to a mic input using software, that would be major because lots of people leave their headphones plugged.
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The quality is not that good though. I've tried it and I need to speak directly into it, a few decimetres away or a little to the side and it's beyond recognition already. At least with the two or so earphones/headphones (don't remember) that I tried, maybe it's different with other hardware?
But the information is captured, even if the signal to noise ratio is very low. There are audio restoration tools nowadays that work amazingly well, some even using AI(or claiming to) - so even if you have a recording where it sounds just like plain noise, there is still some capacity of extracting the signal you need out of it. That's mostly because the background noise is not random, it is of a certain pattern, constant and repeating and therefore can be captured and cancelled. Then the actual signal we need, which differs from the noise pattern, stands out.