I just played a couple of bullet games where my opponent resigned after the 2nd and 3rd move respectively as he dropped a pawn in one and did not like the opening in the second. The ratings did not change. I thought that a game is on once the first pair of moves has been exchanged. Are there different rules for bullet games?
After the first pair of moves, an abort with no record of the game is no longer possible.
From that point until White makes his/her 4th move, the game will be recorded and a win, loss or draw awarded but no ratings adjustments will be made to either side.
Once White has played the 4th move, the game - if rated - will result in ratings adjustments depending on outcome and the players' statistics.
It has always been this way.
Well, w.r.t. the ratings. The record of the game has chagned I believed - you used to be able to abort with no record before whites 4th move as well.