Number one item in their privacy policy:

https://aws.amazon.com/compliance/data-privacy-faq/

Access: We do not access or use your content for any purpose without your agreement. We never use your content or derive information from it for marketing or advertising purposes.

Apart from that, in general in their communications they are clear that they don’t access customers data, unless ordered by law enforcement/court.

Admittedly, deciphering the language could be tricky.