Applying AI to Stack Overflow to make the site have more relevant content (e.g. tag outdated, apply version info) would be detrimental to their revenue model. Going through all the content on SO and tagging it with the relevant versions the answer applies to would be immensely helpful to users but would make page views fall off a cliff most likely.

I read something recent that the SO revenue is dropping and was showing signs of this before the recent AI push. In my opinion, this is because video is king with younger people and SO is geared towards people with beginner questions. You can find a huge amount of sw dev instructional content on youtube.