Yes, Carbon just sends the e-mail out to certain players. I believe it is based on your recent play, but I'm not sure. I know some players that got the pw's for some bonus freerolls
Carbon recently ran, but didn't get the pw for this game... Unfortunately I had my AK busted by some fish's KJ sooted. On a positive note, I know many players that ran deep in this game, including the 2 players that finished head's up! Congrats to them both.