Essentially off-topic but while that's my perception too, actually there are only 3 out of 30 front page stories on AI at the current time, so it's more like 10%
It's definitely the most consistent topic but there's a lot of other stuff.
High tide is around a third (like the other day with the new tlChatGPT release) but it's mostly down around the current level. I knocked this together to explore just this thought: hntags.com
It's definitely the most consistent topic but there's a lot of other stuff.