A litany of new digital gaming stores have sprung up over the last few years, in commensurate response to the growth of the video games market. That market, according to research firm Newzoo, is expected to hit $180.1 billion in revenue for 2021, adding roughly $15 billion per year from now until then. The group also claims that the market is 91% digital, meaning there's a huge electronic money pie for these stores to chase, though the fastest growing and largest portion is for "mobile" gaming. For the PC market, consumer reactions have been generally critical of the publishers that opt to create their own alternative stores instead of Valve's immensely popular Steam .