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You don't get the power from the led, you draw power from its supply. It only needs to run the logic. You would get further intermitent power from the jack pins. Not backing the Bloomberg piece, just saying it's possible.
I'm talking about the LED supply. 20mA at 3V is the max any indicator LED will be powered at (a lot less these days). LEDs are current limited, so you don't get to draw more. That's 60mW. So no, not possible. Not going to draw any significant power off of the Ethernet pins either
*Maybe* if the LEDs are low side switched *and* the current limiting resistor is on the low side and you wire up yourself between anode and the connector shield you could steal more power, but that's a lot of maybes and assumptions about the board design.
Fine. I am not claiming it was done. I am saying there is a possible approach and that you forgot that the part pinout is not the same as the jack pinout.
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