In Codeberg's case, they have chosen not to distinguish between those. Their bright line is "mostly", as in, if your project "mostly" consists of LLM output then it is not allowed. The definition of "mostly" is, of course, vague, and people are going to argue about where the line should be drawn. But there's at least something vaguely approaching an objective measure: they might look through commits and count how many have an LLM listed as a co-author, or they might count the number of lines of code changed by those commits. Who knows, at this point, what they will end up doing. But they're not trying to judge "how well did you curate the output of the LLM"? They have, instead, decided to judge "how many lines/commits/something created by LLMs have ended up in your code?"

> people are going to argue

They should just migrate their stuff elsewhere IMO. Even if all current forges go the length of banning AI-assisted projects, before that completely happens there will be several forges which expressly welcome such projects. Guaranteed.