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What do you think of this prediction?
(programming.dev)
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
They do provide Linux support in other ways though. They even troubleshoot me once with a game I tried to play on Linux and offered a refund.
Gog Galaxy not on Linux is a shame, yes, but its DRM-Free and Linux installers are enough for me to continue to buy from them.
Edit: Heroic Launcher makes a great replacement of Gog Galaxy, maybe even better than the Windows client, from what I'd tried. No multiplayer though.