Stackoverflow visits fell[1] off a cliff since GPT became popular.
Google is getting destroyed by the chatbot workflow because it is no longer the start of a browser session and clickthrus (the things that earn the high sponsored link rates) are falling as more users get their queries answered faster with less effort.
Are they, though? Inaccurate info is pretty common from LLMs.
StackOverflow has been dying a slow death since longer than before ChatGPT. Sure, ChatGPT is helping to accelerate it. The real data (leave aside social/community for a moment) issue with SO.com: Many answers don't age well. So, you have an answer from 8 years ago with 65 upvotes, but now the lang/lib was updated in 2023. A newer, more relevant answer is waaaaaaay down and only has one upvote. Personal note: I still pine for the old days when Joel Spolsky and Jeff Atwood were at the helm. They really knew how to build and sustain a vibrant community.