Traffic from Siri to the web is much higher than traffic from OpenAI, generally. It's the default. People installing ChatGPT takes work. And some of that traffic is also coming from Siri today… It won't after this launches.

Because Siri defaults to dumb search much more often. While ChatGPT sucks up the search results and gives its own answer.

Which either terminates the session, or goads the user into asking a follow-up question, improving retention - the user doesn't leave the app either way.