According to Chinese website tracker GreatFire, China has blocked access to Steam’s Community page. Data suggests that 95% of the Steam Community page is now blocked on all devices in China, preventing access to critical platform elements such as screenshots, discussions, and reviews.
Steam itself, and the store, remain available as of press time. Chinese players will still able to play the games they own, or buy new ones, but the hub pages for games won’t show up for them. It’s pretty bad, but nothing out of the ordinary for China.
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Source: [H]ardOCP – The Steam Community Has Been Blocked In China