The problem is that output from LLMs currently has a legally ambiguous status. You can not risk integrating it into any existing free software right now, so that's why a lot of projects, with some exceptions, choose not to allow it or heavily limit its usage only to specific tasks.
And on a personal note I think obvious LLM output is extremely tasteless. Seeing someone not even use some effort to at least even write their own README file makes me cringe. I always compare it to the same type of feeling you get when you see a corporate logo which uses Comic Sans.
