Your analogy with CI/CD is flawed because while not all were convinced of the merits of CI/CD, it's also not technology built on vast energy use and copyright violation at a scale unseen in all of history, which has upended the hardware market, shaken the idea of job security for developers to its very foundation and done it while offering no really obvious benefits to groups wishing to produce really solid software. Maybe that comes eventually, but not at this level of maturity.

But you're right it's probably unenforceable. They will probably end up accepting PRs which were written with LLM assistance, but if they do it will be because it's well-written code that the contributor can explain in a way that doesn't sound to the maintainers like an LLM is answering their questions. And maybe at that point the community as a whole would have less to worry about - if we're still assuming that we're not setting ourselves up for horrible licence violation problems in the future when it turns out an LLM spat out something verbatim from a GPLed project.