As reported by Mixmag:
"Both of Rusko's albums have been released on Diplo's Mad Decent label but now the UK dubstepper's contract with the imprint is up. A spokesman for Rusko said: "He finished his deal [with Mad Decent] and rather than renew it, or find another label, he's decided to self-release for free to fans with the aim of getting his music out there widely to the max amount of people in the easiest way possible."
All of the real money in EDM nowadays is by playing live shows. Rusko and Pretty Lights know this fact and soon everyone else will follow along.