Personally I wouldn't use it, it still belongs to an advertiser specialised on extracting user information. Not that I expect that other AI companies value privacy much higher. But clean smell also means bland smell.
I don't however like the idea of having Google deeply embedded in my machine and Siri will definitely be turned off when this happens. I only use Siri as an egg timer anyway.
This seems like a odd move for a company that sells privacy.
Given my stance about AI, I'll definitely not use it, but I understand Apple's choice. Also this choice will give them enough time to develop their infrastructure and replace parts of it with their own, if they are planning to do it.
> Not that I expect that other AI companies value privacy much higher.
Breaching privacy and using it for its own benefit is AIs business model. There are no ethical players here. Neither from training nor from respecting their users' privacy perspective. Just next iteration of what social media companies do.