Unless something has changed, customer data leaks to any merchant selling through Amazon.

You can fulfill an existing SKU via Prime and get full name and shipping detail on anyone who buys.

This means anyone selling on Amazon can ~buy personal data of people who want a particular product by setting the lowest price among sellers, clearing your inventory first.

At least this was what I observed selling an ebike part I designed (new sku) and competing to sell bafang ebike motor brake sensors.