I had a 5 minute conversation with my niece at the park about rotary phones and now my feed is full of rotary phone-related articles. This happens more times than I can remember.
My gut reaction is that it listens to me, either directly or via some app, but I know Google has refuted this fact. I suppose this is testable too, so I tend to fall on the confirmation bias side of things.
I am confident it did not, that conversation was out of my mind as soon as it ended, which was why I was so surprised to see it dredged up again in my feed.