Heroes of the Storm, Blizzard's all-star MOBA, hasn't been looking too healthy lately. At the end of 2018, Blizzard announced that it was scaling back support, moving developers off the game and killing its competitive league. It perseveres and continues to be updated, however, but it does feel like it's winding down.
According to Blizzard co-founder and former president Mike Morhaime, the mistake was not leveraging Dota's popularity early enough. The original Defense of the Ancients mod sprouted out of Warcraft 3, making Blizzard indirectly responsible for the rise of the genre. But it was one of the last studios to jump on the bandwagon.
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