> Maintainers can...insist on disclosure of LLM origin

On the internet, nobody knows you're a dog [1]. Maintainers can insist on anything. That doesn't mean it will be followed.

The only realistic solution you propose is using LLMs to review the PRs. But at that point, why even have the OSS? If LLMs are writing and reviewing the code for the project, just point anyone who would have used that code to an LLM.

[1] https://en.wikipedia.org/wiki/On_the_Internet,_nobody_knows_...