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Microsoft - keep your filthy hands off Valve, leak shows MSFT would buy Valve
(www.gamingonlinux.com)
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
I was very skeptical Proton would work as well as it does but it really is a literal game changer.