I'd give them the benefit of the doubt here. It's probably just because of the voice control, which can be presumably used for web search. And they personalize the web search with your history.
It looks more like poor engineering than a dark pattern.
I am going to speculate that it isn't poor engineering per-say but more likely that they are solving for 95-99% use case and not spending the man-hours to make their systems work for the rest.
They create things for the 99.9999% that don't care about privacy and will never touch those settings. When you leave that massive group, that's when bugs will be way more common.
We could argue that they intentionally only care about UX when you give them your data but then again that's capitalism, right?
They might have to give you choice to turn those things off, but nobody can force them to give you the same experience. Imagine any executive saying he will focus on giving a great experience for the users that they can't make money out of. He'll be out of a job very quickly.
It looks more like poor engineering than a dark pattern.