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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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Videos games aren't like food or housing. If you want to buy a game you can look up all the different sites selling it and buy from which ever one you think is best.
If you're a game developer, then the ability to sell games does buy food and housing, and you sell a lot more games on Steam than anywhere else.
And if you want to sell on a good platform that platform is going to want to take a cut.