Eldar is not leaking anything, he's cooperating with Nokia and other companies. If you follow his twitter he needs the green light before posting.

If companies are upset with him or if he got phones illegally, he would have been sued and in jail long ago. Trading prototype phones is illegal.

Companies can always confiscate all the protos from him, then what will Eldar write? He's working hand in hand with these companies and are are probably paid by them.