I didn't actually create my account until 2021? 2022? I can't remember. And I didn't make my first post or even comment until just last week.
While I think a minimum post count or reputation metric could perhaps reduce the AI generated posts, introducing friction also makes it harder for real people to contribute anything meaningful.
Furthermore, what does it matter if it's "AI generated"? Is some AI content ok? What's the pass/fail threshold on human vs AI generated text?
I made a Show post last week where I heavily relied on AI. I'm sure there are some "tells." But even so, I spent more than three hours working on the content of my post and my first response. Would my post have been acceptable to you?