There are different types of contracts. A standard form contract or "Contract of Adhesion" has certain limitations because it is where terms are created by only one party, in this case Amazon.

- While these types of contracts are not illegal per se, there exists a very real possibility for unconscionability. In addition, in the event of an ambiguity, such ambiguity will be resolved contra proferentem against the party drafting the contract language.

https://en.wikipedia.org/wiki/Standard_form_contract