Are y'all seriously surprised? The Hip Hop & Pop community has done nothing but borrow and steal from Dance Music for the last 15+ years... what do you expect? HipHop&Pop hasn't been about being innovative in forever... hell, since Jackson in the 80s.
And why you (OP) even care about dubstep being "ruined/tarnished" by a pop singer is beyond ironic because dubstep (the newer tagged genre since about '02) has done nothing but steal ALL of its Techyness/Edits/Fills from Nuskool Breakbeat and various kinds of DnB/Jungle... hell, and Trance, and all kinds of House.
"dubstep" of the last decade has been nothing more than a Thieving Genre in it's own right. True Dubstep is nothing more than clean Sine wav bass with simple, simple drumwork.
penny
penny