Set up a GitHub action to auto-close any pull requests from anyone not on an approved list.
Leave a message in the pull request that if they want to argue their case for a pull request they can send a message through a communication channel of your choice, and say that anyone sending a message with AI generated text, even to help with language and grammar will be banned.
Leave a message in the pull request that if they want to argue their case for a pull request they can send a message through a communication channel of your choice, and say that anyone sending a message with AI generated text, even to help with language and grammar will be banned.