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and i quote
"The success of MOBA titles indicates a subtle but important shift in the way people like to play online. Offering the same fast paced action as first-person shooter games, MOBAs have quickly become one of the most popular game genres worldwide, growing their share of the overall MMO category from 16% to 24% in just the last year."
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"as World of Warcraft now also offers microtransactions and a partial free-to-play component. It is a sign that things are changing, especially for the major publishers, when a company like Activision retires Titan and, instead, doubles down on Heroes of the Storm."