chess.com employs a Fair Play Policy in Live Chess. One of the criteria of this policy is that players must not "frivolously abort games because they don't want to play black, etc." Doing so will result in consequences (e.g, limited playing options).
However, the fact that there actually IS an abort button available very early in the chronology of each game, suggests that at least its infrequent use is certainly permissible.
Are there any penalties attached to aborting a game?