Earlier quoted context omitted.
If Amazon refuses to tell you, you can make a request under EU law that they have to honor. For example, in Germany this is implemented in Bundesdatenschutzgesetz §34: You have, once every 12 months, the right to demand (and receive, for free) from any entity that stores any data about you, all data that they have stored about you, and all probabilistic models derived from it. So, you'd make a request under BDSG §34,…
I did this to my cell provider a few years ago. As a protest around some privacy law. Holy crap they got a lot of data.
This is going to get interesting. (Especially as "probabilistic models" includes likely also all neural networks trained on your data that are used to rate your behaviour. That'd be a wealth of data if one could enforce that.)