I guess we should've expected it was someone who didn't mind killing people in real life.
Kirito's sword skills may become more of a liability now, since the matches are public knowledge. And, a glowing sword may be a bit of a problem in night environments.
I suspect Kirito's failure to sign up for "top prizes" may come back to bite him. (Also, if the game is in a grey area legally, it seems strange that it requires your real life contact info, instead of, say, the bitcoin alternative of a Swiss bank account.)