Um, all Apple did was get OpenAI's free version on the product.... for free. And "free" in this case means your data is the payment. Any use of ChatGPT does not stay on phone, it is via OpenAI's servers.Very smart by Apple. Shows you how big they are and how eager ChatGTP is to get into every household.
The benefits of the paid ChatGTP Plus tier are quickly diminishing though.
The only AI that stays on phone, is going to be Apple's AI, aka Siri 2.0, which by all accounts is actually underwhelming compared to Apple's marketing hype.