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72% of devs believe Steam has a monopoly on PC games, according to study
(www.gamesindustry.biz)
Steam is a video game digital distribution service by Valve.
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Issue tracker for Linux version of Steam
They don't have a monopoly. They just have the best platform. It offers a lot of quality of life features along with the games and rarely causes issues. I can't even recall them ever doing anything anticompetitive. There are other platforms available to purchase from if you don't like steam. GoG for instance. Or Epic if you want to support assholes.