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Minor nit: power is available for the jack itself since it typically has two LEDs. So if you modified a jack previous to board mounting, you have power. Not enough to need heat dissipation, but enough to run a small chip.
Not a small chip able to MITM 1000BASE-T. You aren't going to get more than 60mW from an LED.
Just a single 100BASE-TX PHY is twice that, a 1000BASE-T one is like 500mW.
https://goo.gl/images/sZFb7x Notice the LED pins are totally independent.
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
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