They don't require food, just a power source, so they harness the computing power of every computer on Earth infected with DRM and use it to charge their batteries.
I do think they're cannibals, i mean, why else would those little puny fools be part robot?
They eat chunks out of each other and then replace the missing body parts with robotic parts.
I know that that's disturbing, but its still a guess.
BlueMonkey555, leader of the Jekrel nation. All hail the Jekrel Empire! Hello Mushroom!
HaveANiceDay! Sig by LSSunday! Woo hoo!