Competition? From top to bottom, they stole IP for the purpose of selling it. If there was zero content in common and with no overlap in quests, locations, etc, then a fair use argument might make some sense. Instead, they chose to set up shop next to Barnes and Noble and offer to sell photocopied books that they go next door and steal, then call it competition.
> they stole IP for the purpose of selling it.
The concept of IP is simply nonsensical to me, let alone the clear category error of trying to apply theft to it. Blizzard was deprived of nothing. Who cares?