Ask HN: Did AMZN share my purchase data with Google adwords?

Hi, I think I know the answer but I figured I would ask anyways.

On black friday I purchased a fire stick for a friend. Today I went over to her place and installed the alexa app and linked her amzn account to her siriusxm account so that she could stream siriusxm over her tv.

I came home and suddenly I have google adsense adds for siriusxm.

To be clear, until today when she asked me, I have never even searched about siriusxm, .. ever.

But today when I get home all the adds I get siriusxm for less than 5 bucks a month.

The only connection between my network and my friends is the fact that the stick, she registered and signed up with was purchased by me.

Am I blowing this out of proportion? Or being paranoid? Or is this something that I should be worried about?