What more indication do you want? A peer reviewed research paper?
Anyone who used ChatGPT frequently enough finds it difficult to get back to using Google. One specific query is all that takes to get an answer from ChatGPT which is on point. The alternative is to rummage through the top few links from Google and trying to construct the information you need after trying different variations of search phrases.
When the iPhone first came out there were arm chair pundits who predicted that no one would buy or use an expensive phone. But the people who actually used it knew that it was the wave of the future even back in the day. Same thing with ChatGPT.