IMO, it's mostly a popularity contest. Apple is well-loved and people want to make excuses for them whereas Blizzard has been getting a lot of negative PR for a couple years now and this new outrage is just a natural fit for Blizzard's already strained public image.

I think it's easy to argue that Blizzard's actions were more egregious, but at the same time Blizzard as a company is also much less important from a cultural perspective (i.e. Blizzard is a popular gaming company whereas Apple operates the most influential application platform on the planet)