Opponents who run there time out on a game instead of resigning it?!!

Report them for stalling and if enough people do so then eventually these individuals will presumably get some sort of sanction for breaking the terms and conditions of the site. They do it hoping you'll get disconnected giving them the underserved win and/or because on their stats it doesn't register as a resignation or checkmate so somehow they think that looks better. It appears they just ran out of time rather than losing. Sad people but there's worse things in life to deal with.

I guess the equivalent on a 10 min rapid game is waiting 200 minutes for the opponent to resign.
In my opinion, it is much more unsportsmenship to lose all pieces except king and not to resign, then sometimes draw in time.