I know Critical Role didn’t have that rule in their contract, especially since they bring so much to the platform.
Linus Tech tips also had a special unique to them contract since they had been simulhosting since the early early days of twitch.
I’m pretty Linus has said on the wan show before that they intentionally didn’t partner with twitch because of this and that’s why they’ve always simulcasted. It may have changed since though.
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.