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72% of devs believe Steam has a monopoly on PC games, according to study
(www.gamesindustry.biz)
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Came here to rant similarly. Just because they're the biggest in the market does not mean they have a monopoly. There are plenty of options available, no one is locked into using or selling on steam.
"Lock-in" doesn't make it a monopoly; market share does, and Steam dominates there. So much so that EA gave up on offering things exclusively on Origin.