Gentoo chose to ban LLMs two years ago. They seem to be doing well.
They are free to keep pretending that they aren’t receiving covert AI contributions, because I’d bet the farm that they are.
Debian has a little more ‘general interest’
The biggest question, I think, is: does a complete LLM ban interfere with, or slow down, security patches? I think it could, as LLMs are used a lot for vulnerability discovery.