Explanation:
As stated in point 1, Amazon allows customers to read the reviews, so that the customer can make a decision to purchase the chosen product.
It also allows the customer to post a review about their opinion. Amazon accepts and displays negative opinion too. That's the wide thought of Amazon.
This review also helps Amazon to self-assess the sale of the product. It will enable itself to transform and be successful in the market.
All the given statement attests / being a proof for its service.