I think there’s a difference from the doom and gloom of your post and the actual problem. Quick generated-spam content is really what you’re arguing against.
I can see the use of well crafted jokes in the form of AI art being acceptable. I do not like low-quality spam content though.
I think it’s too rash to just say “ban AI content” and instead reinforce rules like “Ban low effort posts/comments”. The AI stuff that’s low quality farming has been pretty obvious.