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Valve ban advertising-based business models on Steam, no forced adverts like in mobile games
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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 are working on Proton for ARM devices and will probably try to sell the next Steam Deck with an ARM processor. It wouldn't be too far off for them to make Steam for phones if that becomes reality.