It's common for one set of scammers to target another, to take their competitors out. So it's quite possible for them to be abusing the copyright system to take-out scamming competitors.
Heh, PirateSoftware, he talks about this, being both sec ops and having worked at blizzard. Apparently it's really common for the big coin farmers (which blizzard doesn't like, and would ban if they could identify all the players) to tell blizzard about zero day exploits to prevent their competitors from using them and crashing the market for gold.
But according to many replies to that tweet, they were actually working on behalf of actual copyright infringers.
Not sure what to believe.