[erikswn]

In most european countries (except Britan I guess), there exist nothing like the copyright where the content is protected by ownership.

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.