The Hellfire exploit was probably the least damaging exploit ever: It was too early in the season to have an impact, it was very easy to track and once they finally do their punishment and remove that people that used this exploit for the leaderboards those people will experience a minor setback (and to be honest, the later in the season they do this the more difficult it is to come back from it), and it didn't give any longer-lasting advantage (as opposed to the blood shard exploit).
The Hellfire exploit was probably the least damaging exploit ever: It was too early in the season to have an impact, it was very easy to track and once they finally do their punishment and remove that people that used this exploit for the leaderboards those people will experience a minor setback (and to be honest, the later in the season they do this the more difficult it is to come back from it), and it didn't give any longer-lasting advantage (as opposed to the blood shard exploit).
HC is not dead, but right now you should not play HC (at least on EU).
Blizzard's tweet:
Originally Posted by (Blue Tracker / Official Forums)