Sentence:  <WSD>Derank</WSD> lobbies were used to damage and undermine the statistical profiles and removing the associated unlocks of players lured into playing them, initially those deemed to have played inapproprately by illegitimately improving their profiles by modding. While this may have been an act of retribution, Zakhaev got most of his enjoyment from the anguished responses of those he had <WSD>deranked</WSD>, and the <WSD>deranking</WSD> lobby became a barbed example of counterplay - a vindictive prank to humilieate, annoy, and cost victimes time. 
Meaning of the word marked with <WSD> tags:  To lower or remove achievements and skill level.