If this opens more questions than it answers, then you are simply discovering that you don't understand copyright (which is ok, but not the fault of the Codeberg policy).

> You must not share projects that mostly consist [of LLM-generated code]

> Such projects having an unclear copyright status

There is no bright-line threshold at which a code contribution becomes copyrightable (and therefore relevant). It is a legal question determined by courts. However, nobody in practice has any difficulty determining whether their code is copyrightable.

Codeberg is essentially asking/demanding that "your code" coincides with "code you hold the copyright for". This responsibility can be delegated to other humans, but not to LLMs.