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Twitch will now let streamers simultaneously stream on any service they want
(www.theverge.com)
This is a most excellent place for technology news and articles.
They did have that rule in their contract for a long time. The earlier episodes were streamed by Geek And Sundry which bargained for an exclusion, which applied to all of Geek And Sundry. Critical Role, once independent of Geek And Sundry, had to negotiate a new contract and it took around a year iirc.