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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.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
If it wasn't for Valve's aggressive support for Linux (and GOG being for-profit and hence inherently evil) then I'd definitely prioritize GOG.
Steam's for-profit too. The term you're looking for that describes CDPR but not Valve is "publicly traded" or simply "has shareholders".
"For-profit" refers to a legally binding obligation to shareholders to maximize profit. It does not simply mean "wants money". You can be for-profit without being publicly traded, but since Valve is private we'll never know.