Re: "We’ve built Android 9 to learn from you—
"Spying implies illicit use."
If data is being collected about me without my knowledge and consent, then I'm being spied on regardless of what that data is used for.
"I find it laudible that people want a better personal service but are unwilling to tell google what your preferences are."
I think you're talking about two different groups of people. I absolutely don't want "personal service" in this sense, and I am entirely opposed to companies spying on me.