Not to one-up you, but my worst nightmare is an open source project where all the maintainers are LLM copy-pasters, with little clue to be had otherwise.

And it's already happened, of course. A project I saw mentioned here on HN a while back seemed interesting, and it was exactly that kind of disaster. They started off as a fork of another project, so had a working codebase. But the project lead is a grade-A asshole who gets off on being grumpy to people, and considers any ideas not his to be ridiculous. Their kernel guy is an actual moron; his output is either (clearly) LLM output or just idiocies. Even the side contributors are 100% chatbot pasters.