And you can also get a log of everything you've ever ordered from Amazon, but there are still loads of other signals which aren't visible to you, as evidenced by the fact that you browse a product on amazon.com today, and now for the next week, you see that product advertised back to you all over the web.

Others may be reviews left, reviews voted on, prime video consumed, audio/video/book samples consumed, kindle activity, how long you spend on a product page, how you scroll on it, the breadcrumb of how you got there, and surely dozens more.

Home claims this as well, and I for example have a log of audio clips and transcriptions of all of my google now searches.