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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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They have the largest share and can direct the market/development, no question, but they not a monopoly. I think GOG has a good shot to complete as time carries on. At least while Gabe is still alive, they've been relatively ethical.
If the choice of largest developer platform is between Steam and companies like Epic, EA, or Microsoft, Steam still looks like a better alternative.
That means they're a monopoly. Having some small fry competitors doesn't make you not a monopoly.
Look up the case of Standard Oil, against which an antitrust suit was filed, charging it with abusive monopolistic practices. The case was won, and Standard Oil was broken up - at a time when it had less than 70% market share.