Over on Meta they recently announced a new option for individual sites to have a "AI-generated content" policy banner, offering several options:
We will initially offer two banner text options that all sites in the Stack Exchange network can opt-in to. Those options are the following:
Reminder: Answers generated by Artificial Intelligence tools are not allowed on [Site Name]. Learn more
Reminder: Answers generated by Artificial Intelligence tools must be cited on [Site Name]. Learn more
Do we wish to opt in?