I have a related anecdote. After being on Android since version 1.5 I’ve recently switched over to an iPhone (8) due to privacy and security concerns. Thats when I begun using the voice assistance for the first time. For me, it was a trust issue - I simply had an easier time trusting Apple’s Siri with my voice. On Android I would disable every non-essential Google feature that I could. I don’t feel like I need to do that on IOS.