Oh it's okay, it's a single-player game, it's not that you need any server capacity for that. Other than download servers but it's Steam's problem, not publisher's.
...right?
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They had Twitch integration since the beginning and judging by some accounts they weren't prepared for how much that would be in demand on full release. Each user can see streamer's full inventory and journal, vote on dialogue options when asked, etc. Surely Steam isn't handling that.