Everyone is talking about it , and it is a big concern, but the last 2 years (ever since ChatGPT showed up) ad revenue keeps growing at the same 10%+ . It seems like the money queries (adidas shoes size 45) are still better served with links than overviews, and those are where most of the money comes from. Searching for "what cooking temperature is pork safe to eat" is not something you can easily monetize.

Disclaimer: google stock holder.