Note: I don't know anything about games or livestreaming. This is a genuine question about something that confuses me. Can someone explain why livestreamers can claim their stream as their own original content, but reuploaders can't? I mean, someone who livestreams a game is primarily showing off the artwork and level design and everything put in by the game company. There's like 90% derived content plus 10% original…
In these countries like germany, the personality in the product (in the stream) is protected as a kind of artwork. I think this point of view might be helpful to understand these dynamics.
Did the game designer have their personality in their game? Shurely, however since they are employed the company automatically gets access to these rights and can (as economical instrument) allow streamers to use them.
The streamers itself put their personality as well in the product since this is the reason people are watching it.
However it is hard to argue that a cut of a video entails enough personality to be protected by itself. Therefore according to this law it is a copyright violation.
TLDR: Cutting and reuploading entails no creative process of the creator.